Completely fooled (5,2)
I believe the answer is:
taken in
'completely fooled' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for taken in that I've seen before include "Deceived; accepted" , "Admitted - received - deceived" , "hoodwinked" , "Conned" , "Fooled -- assimilated" .)