Flabbergast, greatly surprise (7)

I believe the answer is:

astound

I believe this is a double definition.

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

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

(Other definitions for astound that I've seen before include "Startle" , "Shock, surprise greatly" , "Stagger" , "Shock - amaze" , "Stupefy" .)

I've seen this clue in The Sun.

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