Agent (3)
'agent' is the definition.
(short for representative)
This is all the clue.
(Other definitions for rep that I've seen before include "Representative; fabric" , "Material for curtains" , "Fabric with a ribbed surface" , "Stuff" , "agent" .)
'agent' is the definition.
(I know that spy is a type of intelligence agent)
This is the entire clue.
(Other definitions for spy that I've seen before include "Enemy agent" , "Glimpse" , "Keep watch secretly, maybe for foreign government" , "Secret agent of government" , "One who collects secret information as for government" .)