Addle (7)
I believe the answer is:
confuse
'addle' is the definition.
(I know that addle is a more specific form of confuse)
This is the entire clue.
(Other definitions for confuse that I've seen before include "Muddle, mix up" , "Disconcert, befuddle" , "Puzzle" , "Bewilder" , "Perplex" .)