Produced sound bread (4)
I believe the answer is:
bred
'produced' is the definition.
(breeding is a kind of producing)
'sound bread' is the wordplay.
'sound' shows a homophone (sound like).
'bread' sounds like 'BRED'.
(Other definitions for bred that I've seen before include "Nurtured" , "Brought forth" , "did produce issue" , "Propagated, raised" , "Multiplied" .)