Crossword Genius

The grassing is effective (7)

Ross

I believe the answer is:

telling

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'effective' is the definition.
(synonyms)

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(Other definitions for telling that I've seen before include "Revealing, significant" , "Powerful - effective" , "Providing information" , "Powerful; relating" , "Counting" .)

I've seen this clue in the Evening Standard.
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