Heard couple will get something to eat (4)
I believe the answer is:
pear
'something to eat' is the definition.
(pear is a kind of food)
'heard couple' is the wordplay.
'heard' shows a homophone (sound like).
'couple' becomes 'pair' ('pair' can be a synonym of 'couple').
'pair' is a homophone of 'PEAR'.
'will get' acts as a link.
(Other definitions for pear that I've seen before include "William, maybe" , "Brilliant" , "Bartlett fruit" , "Juicy fruit" , "Tapering fleshy fruit - reap it" .)