Composer, last character in catalogue (5)
I believe the answer is:
liszt
'composer' is the definition.
(Franz Liszt)
'last character in catalogue' is the wordplay.
'last character' becomes 'z'.
'in' is an insertion indicator.
'catalogue' becomes 'list' (I've seen this before).
'z' put into 'list' is 'LISZT'.
(Other definitions for liszt that I've seen before include "with his partner, drunk?" , "Hungarian piano virtuoso, d. 1886" , "Franz ---, Hung. composer" , "Pianist, father of Cosima Wagner" , "He scored" .)