Create short arrangement for score (11)
I believe the answer is:
orchestrate
'score' is the definition.
(orchestrating is a kind of scoring)
'create short arrangement' is the wordplay.
'arrangement' is an anagram indicator.
'create'+'short'='createshort'
'createshort' anagrammed gives 'ORCHESTRATE'.
'for' is the link.
(Other definitions for orchestrate that I've seen before include "Organise (a complex enterprise)" , "Compose" , "Arrange for a full band" , "Organise (music)" , "Arrange scores" .)