Cynthia of "Sex and the City" (5)
I believe the answer is:
nixon
'cynthia of sex and the city' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for nixon that I've seen before include "See 16 Down" , "Only US president to resign" , "American president known as tricky Dicky" , "Disgraced US president" , "Politician" .)