Outline a score in production (8)
I believe the answer is:
scenario
'outline' is the definition.
(I've seen this before)
'a score in production' is the wordplay.
'production' is an anagram indicator.
'a'+'score'+'in'='ascorein'
'ascorein' with letters rearranged gives 'SCENARIO'.
(Other definitions for scenario that I've seen before include "Outlines of drama" , "Production plan" , "Envisaged situation" , "plotting for a film" , "Written outline of a film or play" .)