Note fight in the vicinity (5)
I believe the answer is:
about
'in the vicinity' is the definition.
(synonyms)
'note fight' is the wordplay.
'note' becomes 'a' (musical note).
'fight' becomes 'bout' (as in a bout in boxing).
'a'+'bout'='ABOUT'
(Other definitions for about that I've seen before include "Apropos, concerning" , "Concerned with" , "Circa" , "Approximately, around" , "Almost; around" .)