She's grey, and may turn paler (5)

I believe the answer is:

pearl

I'm a little stuck... Click here to teach me more about this clue!

'she's' is the definition.

'grey and may turn paler' is the wordplay.
'paler' can be anagrammed to 'PEARL'.
However, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for pearl that I've seen before include "piece of wisdom" , "Oyster growth" , "See 12" , "Much loved and valued person" , "Gem; size of type" .)

I've seen this clue in the Evening Standard.

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