Crossword Genius

Pearl's mum (5)

Ross

I believe the answer is:

nacre

'pearl's mum' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for nacre that I've seen before include "Constituent of inlay furniture" , "inside of shell" , "Pearl's mum" , "Mother of pearl" , "valuable material" .)

I've seen this clue in the Evening Standard.
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