Hold back; ice (7)
I believe the answer is:
reserve
I believe this clue is a double definition.
'hold back' is the first definition.
(I've seen this before)
'ice' is the second definition.
(both can mean coldness or aloofness)
(Other definitions for reserve that I've seen before include "Keep for someone - spare bod" , "8 [RESTRAINT]" , "Lack of openness" , "Bank" , "cool" .)