Ice store (7)
I believe the answer is:
reserve
This clue is a double definition.
'ice' is the first definition.
(both can mean coldness or aloofness)
'store' is the second definition.
(a reserve is a store or supply of something)
(Other definitions for reserve that I've seen before include "Book - substitute player" , "Hold back" , "Conservation area" , "left on the bench?" , "8 [RESTRAINT]" .)