Kiln for drying hops (4)
I believe the answer is:
oast
'kiln for drying hops' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for oast that I've seen before include "Where to cook" , "Oven for hops" , "Hop drying kiln" , "Cooker" , "Hop-kiln" .)