Stunned, stupefied (5)
I believe the answer is:
dazed
I believe this clue is a double definition.
'stunned' is the first definition.
('daze' can be a synonym of 'stun')
'stupefied' is the second definition.
(I've seen this in another clue)
(Other definitions for dazed that I've seen before include "almost out" , "Stupefied" , "Seeing stars?" , "Stunned, confused" , "Stunned or bemused" .)