Maigret's odd music (7)
I believe the answer is:
ragtime
'music' is the definition.
(ragtime is a kind of music)
'maigret's odd' is the wordplay.
'odd' indicates an anagram.
'maigret' is an anagram of 'RAGTIME'.
(Other definitions for ragtime that I've seen before include "Scott Joplin art form" , "musical genre" , "Early jazz style" , "Maigret (anag)" , "Migrate to find jazz music" .)