Crossword Genius

"Jam" the golfer may have use for (5)

Ross

I believe the answer is:

wedge

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

I can't explain the rest of the clue.

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(Other definitions for wedge that I've seen before include "Lofting golf club" , "It may cause division" , "Tapered insert" , "Tapering block" , "Chunk" .)

I've seen this clue in the Evening Standard.
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