Handel work (8)
I believe the answer is:
oratorio
'handel work' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for oratorio that I've seen before include "Large-scale sacred musical work" , "Sung composition based on a religious theme" , "Musical work for orchestra and voices" , "eg Handel's 'Messiah'" , "Say, Samson" .)