Great surprise (9)

I think it could be either:

Which length description are you looking for?:

astonishment

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

This is the entire clue.

(Other definitions for astonishment that I've seen before include "confusion" , "Amazement" , "Wonder" , "Stupefaction" , "Great surprise" .)

I've seen this clue in The Mirror and The Independent.

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