Macaroni wheat (5)
I believe the answer is:
durum
'macaroni wheat' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for durum that I've seen before include "Type of flour used for pasta" , "Wheat for pasta flour" , "Wheat variety" , "Hard type of wheat" , "Kind of wheat used to make pasta" .)