A version of this Errol Garner jazz standard was Johnny Mathis's signature song (5)

I believe the answer is:

misty

(Other definitions for misty that I've seen before include "Indistinct in outline" , "Indistinct; slightly foggy" , "Hazy" , "It's not clear" , "'Play - - for me' (Clint Eastwood film)" .)

I've seen this clue in The Times.

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