Male prison, dreadfully cold (10)
I believe the answer is:
impersonal
'cold' is the definition.
('impersonal' can be similar in meaning to 'cold')
'male prison dreadfully' is the wordplay.
'dreadfully' indicates an anagram.
'male'+'prison'='maleprison'
'maleprison' anagrammed gives 'IMPERSONAL'.
(Other definitions for impersonal that I've seen before include "Objective; disinterested" , "Cold" , "Ignoring one's own feelings" , "Cool" , "Aloof" .)