Kind of music newspaper issue sent up (7)
I believe the answer is:
ragtime
'kind of music' is the definition.
(I've seen this before)
'newspaper issue sent up' is the wordplay.
'newspaper' becomes 'rag' (rag is a kind of newspaper).
'issue' becomes 'emit' (I've seen this before).
'sent up' is a reversal indicator.
'emit' backwards is 'time'.
'rag'+'time'='RAGTIME'
(Other definitions for ragtime that I've seen before include "musical genre" , "Scott Joplin music style" , "Syncopated music form" , "Kind of music" , "Jazz music for Maigret" .)