Crossword Genius

Quantity of work girl shoulders beginning to polish one large mirror (4,5)

Ross

I believe the answer is:

pier glass

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'large mirror' 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 pier glass that I've seen before include "wall mirror" , "large mirror" .)

I've seen this clue in The Times.
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