Crossword Genius

Significant activity associated with grass? (7)

Ross

I believe the answer is:

telling

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'significant' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for telling that I've seen before include "Counting" , "relation" , "Effective - narration" , "Providing information" , "briefing" .)

I've seen this clue in The Independent.
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