Collects what may be spare (5)
I believe the answer is:
reaps
'collects' is the definition.
(reaping is a kind of collecting)
'may be spare' is the wordplay.
'may be' is an anagram indicator.
'spare' is an anagram of 'REAPS'.
'what' is the link.
(Other definitions for reaps that I've seen before include "Gleans or harvests" , "Harvests (a crop)" , "Harvests with strange spear" , "Cuts, gathers grain" , "crops" .)