Unidentified coin ingot in the change? (9)

I believe the answer is:

incognito

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'unidentified' is the definition.
(thesaurus)

'coin ingot in the change?' is the wordplay.
'coin ingot' can be anagrammed to 'INCOGNITO'.
But, I'm not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for incognito that I've seen before include "hiding identity" , "Keeping one's identity a secret" , "Under an assumed name" , "With one's identity concealed" , "Covertly" .)

I've seen this clue in the Sydney Morning Herald.

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