Musical Oliver! finally worked reflecting story (9)
I believe the answer is:
narrative
'story' is the definition.
(I know that story can be written as Narrative)
'musical oliver finally worked reflecting' is the wordplay.
'musical' becomes 'evita' (Andrew Lloyd Webber musical).
'finally' says to take the final letters.
'worked' becomes 'ran' (eg a machine that works is running).
'reflecting' says the letters should be written in reverse.
The last letter of 'oliver' is 'r'.
'evita'+'r'+'ran'='evitarran'
'evitarran' written backwards gives 'NARRATIVE'.
(Other definitions for narrative that I've seen before include "Spoken account; story" , "Telling a story" , "Report" , "Story line" , "Storyline" .)