Crossword Genius

Face the sound of pop (4)

Ross

I believe the answer is:

phiz

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

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

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for phiz that I've seen before include "Dickens's illustrator" , "former illustrator" , "Face" , "mug" , "Dial" .)

I've seen this clue in The Telegraph.
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