Trick or dupe (7)
I believe the answer is:
mislead
I believe this clue is a double definition.
'trick' is the first definition.
(I've seen this in another clue)
'dupe' is the second definition.
(I've seen this in another clue)
(Other definitions for mislead that I've seen before include "Take someone in the wrong direction" , "Cause someone to believe something is not true" , "Fool" , "Cause someone to have a false belief" , "Give a wrong impression to (someone)" .)