Banger from Charli XCX album practised in auditorium (9)

I believe the answer is:

bratwurst

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

'banger' is the definition.
(bratwurst is a kind of banger)

I don't understand the rest of the clue.

(Other definitions for bratwurst that I've seen before include "Type of German sausage" , "German pork sausage" , "banger" , "German port sausage" .)

I've seen this clue in The Independent.

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