Looked in amazement at the egg flip brought in, astonished (9)

I believe the answer is:

staggered

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

I don't understand how the rest of the clue works.

(Other definitions for staggered that I've seen before include "Moved unsteadily, being deeply shocked" , "not to be starting together" , "Deeply shocked or walked unsteadily as if about to fall" , "Did floor" , "Arranged to take place at intervals" .)

I've seen this clue in the Evening Standard.

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