Nickname of the cold, calculating Raikkonen (6)

I believe the answer is:

iceman

(Other definitions for iceman that I've seen before include "eugene o'neill play'the......cometh'" , "assassin" , "Eugene O'Neill's figure of 'death' (the one who cometh!)" , "Professional killer (US slang)" , "'The ------ Cometh', 1939 play by Eugene O'Neill" .)

I've seen this clue in The Times.

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