Crossword Genius

Pearl's mother (5)

Ross

I believe the answer is:

nacre

I believe this clue is a double definition.

'pearl's' is the first definition.
(nacre is another name for mother-of-pearl)

'mother' is the second definition.
(I have seen 'Mother of pearl ' mean 'nacre' so perhaps 'mother' could also mean 'nacre')

(Other definitions for nacre that I've seen before include "Mother-of-pearl - crane (anag)" , "Mother-of-pearl from shellfish" , "Constituent of inlay furniture" , "inside of shell" , "valuable material" .)

I've seen this clue in the Evening Standard.
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