When the man comes in to see the representatives (6)
I believe the answer is:
agents
'the representatives' is the definition.
(agent is a kind of representative)
'when the man comes in' is the wordplay.
'when' becomes 'as'.
'the man' becomes 'gent' (gent is a kind of man).
'comes in' is an insertion indicator.
'as' placed around 'gent' is 'AGENTS'.
'to see' is the link.
(Other definitions for agents that I've seen before include "They do business on behalf of others" , "Factors" , "travelling salesmen" , "They act for others" , "They act for actors" .)