Surprise, confuse (8)
I believe the answer is:
confound
This clue is a double definition.
'surprise' is the first definition.
(I've seen this before)
'confuse' is the second definition.
(I know that confuse can be written as confound)
(Other definitions for confound that I've seen before include "Bewilder" , "Nonplus" , "Astonish and confuse" , "Mix up" , "Puzzle" .)