Hoodwink impressionable candidate (9)
I believe the answer is:
contender
'candidate' is the definition.
(I've seen this before)
'hoodwink impressionable' is the wordplay.
'hoodwink' becomes 'con' (I've seen this in other clues).
'impressionable' becomes 'tender' (I've seen this in another clue).
'con'+'tender'='CONTENDER'
(Other definitions for contender that I've seen before include "Struggler in rivalry" , "One fighting others (for something)" , "Trend once (anag.)" , "One seeking title" , "Candidate" .)