Bond conceals a cold charm (9)
I believe the answer is:
character
'charm' is the definition.
'bond conceals a cold' is the wordplay.
'bond' becomes 'charter'.
'conceals' indicates putting letters inside.
'a cold' becomes 'ac' (I've seen this in other clues).
'charter' enclosing 'ac' is 'CHARACTER'.
(Other definitions for character that I've seen before include "Make-up" , "Person in a play; letter" , "Letter or number" , "Distinctive nature" , "card" .)