Is it possible for someone to clone Itachi Uchiha?

Question

Recently, in Boruto, we found out that Koji Kashin of The Kara is a clone of Jiraiya, created by Amado to kill Jigen. But, is it possible to create a clone of Itachi Uchiha?

Amado used the DNA from Jiraiya’s severed arm, which had been ripped off by Pain before the rest of the body was thrown into the sea to clone him. It was never explained what was done with Jiraiya’s arm, and Kabuto could not find it during the war. But perhaps Amado had come to the place first and collected the arm before anyone else came looking for it.

Answer 1

This answer and question is mostly speculative, but it should be able to get answered based off what has been revealed in the plot.

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One fact that should be certain is:

• Ideally, any character in the Naruto/Boruto universe should be able to be cloned, provided that he or she who wants to duplicate that person has access to that persons DNA. This follows the same principle as Summoning: Impure World Reincarnation, minus the body sacrifice that the jutsu requires.

Considering the above, one should be able to clone any character in Naruto as long as they have access to their DNA. Kabuto explained:

• The above manga panel explains all that is needed to bring someone back via Edo Tensei is the person who is being resurrected DNA. As long as anyone can access Itachi's DNA, they should be able to clone him for whatever purpose they need to.

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(Again, this is speculative, because the question is speculative in a way, but can be answered based off of what is revealed in the plot and facts given throughout the series.)

Answer 2

Although the main question is answered by @Daniel, I want to highlight and elaborate the second para of OP's question.

Amado used the DNA from Jiraiya’s severed arm, which had been ripped off by Pain before the rest of the body was thrown into the sea to clone him. It was never explained what was done with Jiraiya’s arm, and Kabuto could not find it during the war. But perhaps Amado had come to the place first and collected the arm before anyone else came looking for it.

Yes, it is true that Jiraiya wasn't revived in the final arc of NS by Kabuto through Edo Tensei and the reason for that is quite different in anime and manga. In Masashi Kishimoto's original story in manga, Kabuto claims that he could get a big enough sample of Jiraiya's DNA to reanimate him, but Obito says not to push his luck. However, in the anime, Kabuto simply says that he can't reanimate Jiraiya because his body is at the bottom of the sea. Considering all the other powerful ninja Kabuto brings back, this is a weak excuse, especially since he can go through great lengths to bring back DNA of dead ninjas. The real reason Jiraiya isn't reanimated is to protect the integrity of the character's emotional final scenes in NS. But if we consider the context of the narrative, his omission in the final war is certainly odd.

Now, the absence is somewhat explained in Boruto. Kashin Koji is thought to be a clone of Jiraiya because Kara were heavily involved in genetic manipulation and the concept of clones is already known in Boruto i.e. Shin. So, Kara might have took the severed arm of Jiraiya for themselves leaving Kabuto with nothing to work with. Kara have been operating in secret for years, and they were artificially creating ninjas appears to be their chief recruitment method. Even if Kabuto did manage to get some DNA, he cannot ressurect him because Kashin Koji was already a clone of him and the rule of Edo Tensei is that the body must be dead in the first place in order to get reanimated.

Source: https://screenrant.com/boruto-naruto-jiraiya-reanimation-plot-hole-kashin-koji/