Large bundle of hay (4)
I believe the answer is:
bale
'large bundle of hay' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for bale that I've seen before include "Bundle of goods" , "Large bundle as of straw" , "(Make into a) bundle of hay" , "Bound bundle" , "Bundle of hay or cotton" .)