Ice to keep fresh without power (7)
I believe the answer is:
reserve
'ice' is the definition.
(both can mean coldness or aloofness)
'keep fresh without power' is the wordplay.
'keep fresh' becomes 'preserve'.
'without' suggests deleting specific letters.
'power' becomes 'p' (symbol in physics).
'preserve' with 'p' taken away is 'RESERVE'.
'to' is the link.
(Other definitions for reserve that I've seen before include "8 [RESTRAINT]" , "Lack of openness" , "Set aside - shyness" , "One on bench" , "cool" .)