Maigret's sort of music? (7)
I believe the answer is:
ragtime
'music?' is the definition.
(I know that ragtime is a type of dance music)
'maigret's sort' is the wordplay.
'sort' indicates anagramming the letters.
'maigret' with letters rearranged gives 'RAGTIME'.
'of' acts as a link.
(Other definitions for ragtime that I've seen before include "musical style" , "Syncopated music genre" , "Maigret (anag)" , "Syncopated jazz style" , "Syncopated music style" .)