Offenbach's famous tune has the ability to touch Toscanini's heart (6)
I believe the answer is:
cancan
'offenbach's famous tune has' is the definition.
I can't judge whether this definition defines the answer.
'ability to touch toscanini's heart' is the wordplay.
'ability' becomes 'can' (I can't justify this - if you can you should believe this answer much more).
'to touch' means one lot of letters go next to another.
'heart' means to look at the middle letters.
The central letters of 'toscanini' are 'can'.
'can'+'can'='CANCAN'
'the' acts as a link.
Can you help me to learn more?
(Other definitions for cancan that I've seen before include "Lively French dance, doubly permissive" , "Lively French stage dance" , "Chorus-girl dance" , "Lively Parisian dance" , "Daring French dance, doubly permissive" .)