pull a fast one on (8)
I believe the answer is:
hoodwink
'pull a fast one on' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hoodwink that I've seen before include "Dupe, bamboozle" , "Delude" , "Put wool over eyes of" , "Deceive, trick" , "Deceive, fool" .)