Composer's final jazz piece included in catalogue (5)
I believe the answer is:
liszt
'composer's' is the definition.
(Franz Liszt)
'final jazz piece included in catalogue' is the wordplay.
'final jazz piece' becomes 'z' (I can't justify this - if you can you should believe this answer much more).
'included in' indicates putting letters inside.
'catalogue' becomes 'list' (I've seen this before).
'z' put within 'list' is 'LISZT'.
(Other definitions for liszt that I've seen before include "Franz . . . . ., great Hungarian composer" , "Brahms and - is rhyming slang for drunk" , "Famous composer" , "Franz . . . . ., 19th century Hungarian composer and pianist" , "Hungarian piano virtuoso, d. 1886" .)