Beethoven's "Choral" Symphony (5)
I believe the answer is:
ninth
'beethoven's choral symphony' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for ninth that I've seen before include "Half-way hole?" , "Ordinal number" , "Eg, Beethoven's choral symphony" , "interval" , "Beethoven's "Choral", for example" .)