Bemused (7)
(Other definitions for flummoxed that I've seen before include "at a loss" , "Confounded" , "at sea" , "thrown" , "Stumped" .)
'bemused' is the definition.
(I know that bemused can be written as baffled)
This is the entire clue.
(Other definitions for baffled that I've seen before include "Completely mystified" , "Frustrated" , "Perplexed" , "Confused" .)