Urge a fellow to be a publicity representative (5,5)
I believe the answer is:
press agent
'representative' is the definition.
(I know that press agent is a type of representative)
'urge a fellow' is the wordplay.
'urge' becomes 'press' (synonyms).
'fellow' becomes 'gent' (synonyms).
'press'+'a'+'gent'='PRESS-AGENT'
'to be a publicity' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for press agent that I've seen before include "PA" , "Person seeking favourable publicity on behalf a client" , "PR person" , "publicist" .)