Three wise men treat at first with fresh leaves, nuts and medicinal plants from India (4,5)

I believe the answer is:

neem trees

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'plants from india' is the definition.
The answer and definition can be both plants as well as being plural nouns.
Perhaps you can see an association between them that I can't see?

I can't explain the remainder of the clue.

Can you help me to learn more?

I've seen this clue in The Hindu.

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