Where to wash at dilapidated hut in temporary accommodation (7)
I believe the answer is:
bathtub
'where to wash' is the definition.
(a place to wash oneself)
'at dilapidated hut in temporary accommodation' is the wordplay.
'dilapidated' is an anagram indicator.
'in' is an insertion indicator.
'temporary accommodation' becomes 'BB' (B and B, bed and breakfast).
'hut' anagrammed gives 'htu'.
'at'+'htu'='athtu'
'athtu' inserted inside 'bb' is 'BATHTUB'.
(Other definitions for bathtub that I've seen before include "Large vessel" , "Container for the body during ablutions" , "Where to come clean" , "Film made by soap" , "jacuzzi, for instance" .)