Contract negotiator (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
agent
'contract negotiator' 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 "Actor" , "Go-between" , "Traveller" , "Catalyst" , "Spy; service provider" .)