Stare open-mouthed (4)

I think it could be either:

gawp

gape

'stare open-mouthed' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for gawp that I've seen before include "Stare stupidly" , "Stare open-mouthed" , "Watch open-mouthed" , "Stare idiotically" , "Look stupid(ly)" .)

I've seen this clue in The Mirror, the Newsday, the LA Times, the USA Today and The Guardian.

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