Joe goes back to the toilet of the snow house (5)
I believe the answer is:
igloo
'the snow house' is the definition.
(I've seen this in another clue)
'joe goes back to the toilet' is the wordplay.
'joe' becomes 'GI' (GI Joe).
'goes back' says the letters should be written backwards.
'to the toilet' becomes 'loo' (loo can informally mean a toilet).
'gi' backwards is 'ig'.
'ig'+'loo'='IGLOO'
'of' is the link.
(Other definitions for igloo that I've seen before include "northern home" , "Inuit shelter" , "From domed hut" , "Arctic home" , "Inuit abode" .)