Public nuisance, disregarding bus lane, turns out to be a well-known composer (7)

I believe the answer is:

puccini

I'm a little stuck... Click here to teach me more about this clue!

'composer' is the definition.
(Giacomo Puccini)

I cannot understand how the rest of the clue works.

(Other definitions for puccini that I've seen before include "Opera producer" , "Italian operatic composer" , "Italian composer of Madam Butterfly" , ""Tosca" composer, Giacomo" , "Composer of 'Madam Butterfly' and 'La Boheme'" .)

I've seen this clue in The Irish Times.

Want a hint initially instead of a full solution? Install my app