Really wow (8)

I think it could be either:

Which length description are you looking for?:

1,3,2,4

astonish

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

This is the entire clue.

(Other definitions for astonish that I've seen before include "Stun" , "electrify" , "'knock for six'?" , "Greatly impress" , "Stagger" .)

I've seen this clue in the LA Times.

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