Handyman, agent, not Romeo, joining corporation (8)
I believe the answer is:
factotum
'handyman' is the definition.
(I've seen this before)
'agent not romeo joining corporation' is the wordplay.
'agent' becomes 'factor' (business term for a representative).
'not' indicates named letters should be taken away.
'romeo' becomes 'r' (phonetic alphabet: alpha, bravo, charlie etc.).
'joining corporation' becomes 'tum' (I can't explain this - if you can you should believe this answer much more).
'factor' with 'r' taken out is 'facto'.
'facto'+'tum'='FACTOTUM'
Can you help me to learn more?
(Other definitions for factotum that I've seen before include "Versatile employee" , "Employee who does many jobs" , "General servant" , "Person employed to do all sorts of work" , "'Retainer, servant (8)'" .)