Hay storage area (4)
I believe the answer is:
loft
'hay storage area' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for loft that I've seen before include "Backward slope in face of golf club" , "Space under barn roof for storing hay" , "Storage space under a roof" , "Kick high in the air" , "that may require insulation" .)