Protruding lip in head of fallen angel, smashed to bits (6)

I believe the answer is:

flange

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

'protruding lip' is the definition.
'flange' can be an answer for 'lip' (thesaurus). I'm not certain of the 'protruding' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for flange that I've seen before include "wider opening" , "Projecting rim or piece" , "Projecting (steel) collar" , "Rim (on wheel)" , "Flat edge" .)

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.