Man eats irregularly -- fellow of note going from bar to bar (7)
I believe the answer is:
smetana
'fellow of note going from bar to bar' is the definition.
(Czech composer Bedrich Smetana - bars of music)
'man eats irregularly' is the wordplay.
'irregularly' is an anagram indicator.
'man'+'eats'='maneats'
'maneats' is an anagram of 'SMETANA'.
(Other definitions for smetana that I've seen before include "Bedrich ____, composer of "The Bartered Bride" and "The Kiss"" , "maker of notes" , "Nineteenth century Czech composer (The Bartered Bride)" , "musician" , "Czech composer, d. 1884 - Eastman (anag)" .)