One knocked out with a club? (5)

I believe the answer is:

divot

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'one' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

I don't understand the remainder of the clue.

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(Other definitions for divot that I've seen before include "Loose piece of turf" , "Piece of turf dug out of the fairway by a golf shot" , "Bit of turf cut out by golf club" , "Golfer's dislodged turf" , "Clump taken by a golf swing" .)

I've seen this clue in the Evening Standard.

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