Business representative (5)
I believe the answer is:
agent
'business representative' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for agent that I've seen before include "Substance that exerts some force or effect" , "Delegate" , "Double-zero-seven, for example" , "Performer's manager" , "Person who does business on behalf of another" .)