New barn for grain husks (4)
I believe the answer is:
bran
'grain husks' is the definition.
(I've seen this in another clue)
'new barn' is the wordplay.
'new' indicates an anagram.
'barn' is an anagram of 'BRAN'.
'for' acts as a link.
(Other definitions for bran that I've seen before include "Health food" , "Dietary fibre source" , "Refuse providing fibre" , "Husks of grain sifted from the flour" , "Milled grain husk" .)