"Jam" the golfer may have use for (5)
I believe the answer is:
wedge
'jam' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for wedge that I've seen before include "Lofting golf club" , "It may cause division" , "Tapered insert" , "Tapering block" , "Chunk" .)