Numb with cold (9)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
unfeeling
This clue is a double definition.
'numb' is the first definition.
('unfeeling' can be a synonym of 'numb')
'cold' is the second definition.
(thesaurus)
'with' acts as a link.
(Other definitions for unfeeling that I've seen before include "Callous" , "Lacking in sympathy or emotion" , "Hard-hearted" , "Heartless" .)