Gobsmack (3)

I think it could be either:

awe

wow

'gobsmack' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for wow that I've seen before include "Expression of amazement" , "Exclamation of admiration - another palindrome" , "Palindromic exclamation of surprise or admiration" , "that's incredible!" , "Impress hugely" .)

I've seen this clue in the USA Today, The Times, The New York Times and The Sunday Times.

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