Crossword Genius

Give the game away regarding marijuana (5)

Ross

I believe the answer is:

grass

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'marijuana' is the definition.
(synonyms)

I don't understand how the remainder of the clue works.

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(Other definitions for grass that I've seen before include "Common plant" , "Might one tell" , "what may be underfoot?" , "Police informer; plant" , "Reefer's content" .)

I've seen this clue in The Times.
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