Nacre (6-2-5)

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6-2-5

mother-of-pearl

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

This is all the clue.

(Other definitions for mother-of-pearl that I've seen before include "Decorative substance got from certain molluscs" , "Internal layer of shell" , "Nacre" , "Ornamental material" , "Iridescent material used in ornamentation" .)

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

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