Corn discard (3)
I believe the answer is:
cob
'corn discard' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cob that I've seen before include "Horse, male swan and loaf of bread" , "A loaf; a nut; a horse" , "Swan of Jacobean origin" , "mount" , "Round loaf of bread" .)