Athlete ruined golf equipment (4,6)
I believe the answer is:
shot putter
'athlete' is the definition.
(shot putter is a kind of athlete)
'ruined golf equipment' is the wordplay.
'ruined' becomes 'shot' (I've seen this before).
'golf equipment' becomes 'putter' (putter is a kind of golf equipment).
'shot'+'putter'='SHOT-PUTTER'
(Other definitions for shot putter that I've seen before include "Fifteen [ATHLETE]" , "Competitor throwing" , "Sportsman" .)