Hymn and carol he orchestrated (7)
I believe the answer is:
chorale
'hymn' is the definition.
(I know that chorale is a type of hymn)
'carol he orchestrated' is the wordplay.
'orchestrated' indicates an anagram (I've seen this in other clues).
'carol'+'he'='carolhe'
'carolhe' with letters rearranged gives 'CHORALE'.
'and' acts as a link.
(Other definitions for chorale that I've seen before include "Lutheran hymn-tune" , "Harmonised hymn tune" , "Psalm or hymn tune" , "Simple hymn tune" , "vocal music" .)