Bundle of hay or straw (5)
I believe the answer is:
truss
'bundle of hay or straw' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for truss that I've seen before include "Tie up tightly; frame" , "Surgical appliance" , "Hay bundle; tomato cluster" , "Architectural corbel" , "Rusts (anag.)" .)