Attacked when excited (6-2)
I believe the answer is:
turned-on
I believe this clue is a double definition.
'attacked' is the first definition.
(to turn on someone is to betray or attack them)
'excited' is the second definition.
('turn on' can be a synonym of 'excite')
'when' is the link.
(Other definitions for turned-on that I've seen before include "Modern phrase for being excited due to drugs or sex" , "Suddenly attacked - state of ecstasy - high" , "Activated -- aroused" .)