Be in cold and horribly damp temporary overnight facility (4,3)
I believe the answer is:
camp bed
'temporary overnight facility' is the definition.
(a fold-out bed)
'be in cold and horribly damp' is the wordplay.
'in' means one lot of letters goes inside another.
'cold' becomes 'c' (eg on taps).
'and' means one lot of letters go next to another.
'horribly' indicates anagramming the letters.
'damp' anagrammed gives '[damp]'.
'c'+'[damp]'='c[damp]'
'be' placed into 'campd' is 'CAMP-BED'.
(Other definitions for camp bed that I've seen before include "outdoor resting place?" , "Structure on which to sleep in a tent" , "Folding support for sleeper" , "temporary overnight accommodation" , "Portable bunk" .)