Member of a state (7)
I believe the answer is:
citizen
'member of a state' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for citizen that I've seen before include "Resident" , "' - - Kane' (film)" , "Inhabitant of a town or city" , "Legally recognised national of a country" , "eg Londoner" .)