Doctorow bestseller (7)

I believe the answer is:

ragtime

(Other definitions for ragtime that I've seen before include "Early jazz style" , "Maigret (anag)" , "Jazz music for Maigret" , "Syncopated music form" , "Style of jazz popularised by Scott Joplin et al" .)

I've seen this clue in the Penny Press.

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