Crossword Genius

Lustrous greyish wild crane (5)

Ross

I believe the answer is:

nacre

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

'lustrous greyish wild crane' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'wild crane' is the wordplay.
'wild' indicates an anagram.
'crane' anagrammed gives 'NACRE'.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.
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