One-storeyed building (8)
I believe the answer is:
bungalow
'one-storeyed building' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for bungalow that I've seen before include "A blowgun (anag.)" , "One-storied house" , "Single-storey home" , "One-storey building" , "It may house" .)