"Sex and the City" star Cynthia (5)
I believe the answer is:
nixon
'sex and the city star cynthia' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for nixon that I've seen before include "American president known as tricky Dicky" , "Only US president to resign" , "Thirty seventh US president" , "US president - subject of an opera by John Adams" , "President re-elected in 1972" .)