Noisy undisciplined protest is about oil primarily (10)

I believe the answer is:

strepitoso

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

'noisy' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Another definition for strepitoso that I've seen is " noisy".)

I've seen this clue in The Sunday Times and The Times.

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