Those in temporary shelter imbibing hot drink (8)
I believe the answer is:
champers
'drink' is the definition.
(informal term for champagne)
'those in temporary shelter imbibing hot' is the wordplay.
'those in temporary shelter' becomes 'campers'.
'imbibing' means one lot of letters goes inside another.
'hot' becomes 'h' (abbreviation eg on taps).
'campers' going around 'h' is 'CHAMPERS'.
(Other definitions for champers that I've seen before include "something sparkling!" , "People putting their teeth in" , "Might they be extremely eager" , "celebratory drink" , "Drink casually" .)