Mother-of-pearl lining Zegna creation (5)

I believe the answer is:

nacre

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'mother-of-pearl' is the definition.
(synonyms)

'lining zegna creation' is the wordplay.
'NACRE' is hidden in amongst the letters.
But, I am unsure how the hidden word is indicated.

Can you help me to learn more?

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

I've seen this clue in The Telegraph.

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