Harvests pears, possibly (5)
I believe the answer is:
reaps
'harvests' is the definition.
(I know this)
'pears possibly' is the wordplay.
'possibly' indicates an anagram.
'pears' anagrammed gives 'REAPS'.
(Other definitions for reaps that I've seen before include "Gleans or harvests" , "crops" , "Cuts, gathers grain" , "Harvests with strange spear" , "Harvests (a crop)" .)