Cold facilities welcomed by a female (5)
I believe the answer is:
aloof
'cold' is the definition.
(synonyms)
'facilities welcomed by a female' is the wordplay.
'facilities' becomes 'loo' (I've seen this in other clues).
'welcomed by' means one lot of letters goes inside another (I've seen this in other clues).
'a female' becomes 'af' (I've seen this in other clues).
'loo' inserted into 'af' is 'ALOOF'.
(Other definitions for aloof that I've seen before include "Unapproachable, distant" , "rather cold" , "Indifferent - by oneself" , "Distant, uninvolved" , "Withdrawn, supercilious" .)