Crossword Genius

Become an informer (5)

Ross

I believe the answer is:

grass

(Other definitions for grass that I've seen before include "Court's covering" , "Common plant" , "Narrow-leaved green herbage" , "Police informer; plant" , "Cannabis (colloq.), informer (colloq.)" .)

I've seen this clue in the Sydney Morning Herald.
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