Spare change, one gathers (5)
I believe the answer is:
reaps
'one gathers' is the definition.
(I've seen this in another clue)
'spare change' is the wordplay.
'change' indicates anagramming the letters.
'spare' with letters rearranged gives 'REAPS'.
(Other definitions for reaps that I've seen before include "Harvests with strange spear" , "Cuts, gathers grain" , "crops" , "Harvests (a crop)" , "Gleans or harvests" .)