Reported grain yield (4)
I believe the answer is:
cede
'yield' is the definition.
(I know that yield can be written as cede)
'reported grain' is the wordplay.
'reported' shows a homophone (sound like).
'grain' becomes 'seed' (I've seen this in another clue).
'seed' sounds like 'CEDE'.
(Other definitions for cede that I've seen before include "Surrender or grant" , "Yield, give way" , "Give up (power to another)" , "Transfer" , "Reluctantly give up" .)