Inclination to include finale from Berlioz, a composer (5)
I believe the answer is:
liszt
'a composer' is the definition.
(Franz Liszt)
'inclination to include finale from berlioz' is the wordplay.
'inclination' becomes 'list' (list can mean to tilt, lean or incline).
'to include' is an insertion indicator.
'finale from' says to take the final letters.
The last letter of 'berlioz' is 'z'.
'list' placed around 'z' is 'LISZT'.
(Other definitions for liszt that I've seen before include "He scored" , "Hungarian piano virtuoso, d. 1886" , "Franz -, Hung. pianist" , "half-drunk?" , "Pianist and composer (often associated with Brahms), d. 1886" .)