Nearly full engine working cold (9)
I believe the answer is:
unfeeling
'cold' is the definition.
(thesaurus)
'nearly full engine working' is the wordplay.
'nearly' means to remove the last letter.
'working' indicates anagramming the letters.
'full' with its final letter taken away is 'ful'.
'ful'+'engine'='fulengine'
'fulengine' with letters rearranged gives 'UNFEELING'.
(Other definitions for unfeeling that I've seen before include "Lacking in sympathy or emotion" , "Callous" , "Hard-hearted" , "Heartless" .)