Unfriendly quality (7)
I believe the answer is:
iciness
'unfriendly quality' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for iciness that I've seen before include "Hostile attitude" , "Extreme cold" , "Hostility, unfriendliness" , "Frostiness" , "Extreme chill" .)