Conductor's jingle? (6)
I believe the answer is:
rattle
I believe this clue is a double definition.
'conductor's' is the first definition.
(Rattle is an orchestra conductor)
'jingle?' is the second definition.
(thesaurus)
(Other definitions for rattle that I've seen before include "Let rat make the sound" , "Clatter or bang" , "Make someone nervous or anxious" , "Sir Simon --, conductor" , "not to compose" .)