Indian leaves preparation of report to auditors (5)

I believe the answer is:

bhang

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'indian' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

I cannot understand how the rest of the clue works.

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(Other definitions for bhang that I've seen before include "Hemp-based narcotic" , "cannabis" , "Leaves and shoots of hemp" , "Narcotic used in India" .)

I've seen this clue in The Times.

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