Crossword Genius

Astonished to be punched in the face (10)

Ross

I believe the answer is:

gobsmacked

'astonished' is the definition.
(I've seen this before)

'be punched in the face' is the wordplay.
I cannot quite see how this works, but
'be' could be 'go' (going is a kind of being) and 'go' is present in the answer.
This explanation may well be incorrect...

'to' acts as a link.

(Other definitions for gobsmacked that I've seen before include "bowled over" , "shocked" , "Dumbfounded" , "Amazed" , "Astounded" .)

I've seen this clue in The Guardian.
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