Crossword Genius

Change put behind a mirror (6)

Ross

I believe the answer is:

silver

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

I cannot understand how the remainder of the clue works.

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(Other definitions for silver that I've seen before include "Long John - -" , "Grey-haired" , "Change - Ag" , "old folk?" , "Silver of precious metal" .)

I've seen this clue in The Globe and Mail.
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