Much seen in association with Romeo (3)
I believe the answer is:
far
'much' is the definition.
(I've seen this in another clue)
'seen in association with romeo' is the wordplay.
'seen in association' becomes 'fa' (I can't explain this - if you can you should believe this answer much more).
'with' is a charade indicator (letters next to each other).
'romeo' becomes 'R' (phonetic alphabet: alpha, bravo, charlie etc.).
'fa'+'r'='FAR'
Can you help me to learn more?
(Other definitions for far that I've seen before include "At a great distance way" , "Remote" , "Very much" , "A long, long way to go" , "Distant" .)