Wrongly assume right to be manipulator (7)
I believe the answer is:
masseur
'be manipulator' is the definition.
(I've seen this before)
'wrongly assume right' is the wordplay.
'wrongly' indicates anagramming the letters (I've seen this in other clues).
'right' becomes 'r' (abbreviation).
'assume' is an anagram of 'masseu'.
'masseu'+'r'='MASSEUR'
'to' acts as a link.
(Other definitions for masseur that I've seen before include "With prearranged postage" , "Muscle manipulator" , "One who kneads and strokes" , "Parlour worker" , "One who kneads and rubs" .)