Crossword Genius

Like her mother, she's grey (5)

Ross

I believe the answer is:

pearl

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'grey' is the definition.
(thesaurus)

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(Other definitions for pearl that I've seen before include "Gem; size of type" , "Object of great worth" , "finest example" , "Off-white colour" , "greatly valued" .)

I've seen this clue in the Evening Standard.
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