Flabbergasted feeling (3)
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I believe the answer is:
awe
'flabbergasted feeling' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for awe that I've seen before include "Great wonder" , "Fearful respect" , "Profound respect" , "Feeling of fear and wonder" , "It makes you wonder" .)