Beethoven's 3rd symphony (6)
I believe the answer is:
eroica
'beethoven's 3rd symphony' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for eroica that I've seen before include "Title of Beethoven's 3rd" , "Nickname of Beethoven's third symphony" , "Name of Beethoven's Third symphony" , "Name of a Beethoven symphony" , "Beethoven piece" .)