Boss excited to replace article in San Remo (7)
I believe the answer is:
supremo
'boss' is the definition.
(I've seen this before)
'san remo' is the wordplay.
'san' becomes 'sup' (I can't explain this - if you can you should give a lot more credence to this answer).
'sup'+'remo'='SUPREMO'
'excited to replace article in' acts as a 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 supremo that I've seen before include "Person invested with great authority" , "Person in overall charge, top banana" , "Top commander" , "big Daddy" , "Overall head" .)