Dwellings with imposing outside toilets (6)
I believe the answer is:
igloos
'dwellings' is the definition.
(I have seen 'Arctic dwellings' mean 'igloos' so perhaps 'dwellings' could also mean 'igloos')
'with imposing outside toilets' is the wordplay.
'with' is a charade indicator (letters next to each other).
'outside' says to hollow out the word (remove centre letters).
'toilets' becomes 'loos' (loo means a toilet).
'imposing' with its middle taken out is 'ig'.
'ig'+'loos' is 'IGLOOS'.
(Other definitions for igloos that I've seen before include "Housing" , "Ice houses for Eskimos" , "polar residences" , "Ice-houses for Eskimos" , "Ice homes for eskimos" .)