Extremely interesting toilets in these ingenious dwellings (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')
'extremely interesting toilets' is the wordplay.
'extremely' suggests removing the centre (only the extremes of the word are used).
'toilets' becomes 'loos' (loo means a toilet).
'interesting' with its centre taken out is 'ig'.
'ig'+'loos'='IGLOOS'
'in these ingenious' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for igloos that I've seen before include "Ice homes for eskimos" , "Arctic homes" , "Houses of snow and ice" , "Ice-houses for Eskimos" , "Ice-houses for Inuits" .)