Small fruit put underground, we hear (5)
I believe the answer is:
berry
'small fruit' is the definition.
(I've seen this in another clue)
'put underground we hear' is the wordplay.
'put underground' becomes 'bury' (I've seen this before).
'we hear' shows a homophone (sound like).
'bury' sounds like 'BERRY'.
(Other definitions for berry that I've seen before include "Smal pulpy fruit" , "Small soft fruit" , "eg Chuck or Halle" , "Small round stoneless fruit, may be black (5)" , "Small edible fruit" .)