Hoses out a building where hops are dried (4,5)
I believe the answer is:
oast house
'where hops are dried' is the definition.
(I've seen this before)
'hoses out a building' is the wordplay.
'building' indicates an anagram.
'hoses'+'out'+'a'='hosesouta'
'hosesouta' with letters rearranged gives 'OAST-HOUSE'.
(Other definitions for oast house that I've seen before include "Hops in here to dry" , "See this building" .)