CIA employee (5)
I believe the answer is:
agent
'cia employee' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for agent that I've seen before include "Representative - means" , "One employed to incite others to commit illegal acts" , "Double-zero-seven, for example" , "Spy; service provider" , "One may be working" .)