Crossword Genius

It's often replaced on sporting grounds (5)

Ross

I believe the answer is:

divot

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'grounds' is the definition.
The answer and definition can be both natural objects as well as being singular nouns.
Maybe there's an association between them I don't understand?

I don't understand the rest of the clue.

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(Other definitions for divot that I've seen before include "Displaced grass" , "Piece of turf dug out of the fairway by a golf shot" , "Clump of turf for a golfer to replace" , "Bit of turf cut out by golf club" , "Golfer's dislodged turf" .)

I've seen this clue in the Evening Standard.
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