"Cool" nickname for Val's "Top Gun: Maverick" character (6)
I believe the answer is:
iceman
(Other definitions for iceman that I've seen before include "assassin" , "'The ------ Cometh', 1939 play by Eugene O'Neill" , "Eugene O'Neill's figure of 'death' (the one who cometh!)" , "Professional killer - jewel thief - Eugene O'Neill character" , "Person with frozen wares" .)