Fill with wonder or astonishment (7)
I believe the answer is:
astound
'fill with wonder or astonishment' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for astound that I've seen before include "Flabbergast" , "Startle" , "Bewilder" , "Shock, surprise greatly" , "Stagger" .)