Crossword Genius

Doctor with adenoids coated metal (8)

Ross

I believe the answer is:

anodised

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'coated metal' is the definition.
The definition suggests a past participle verb which matches the answer.

'doctor with adenoids' is the wordplay.
'adenoids' can be anagrammed to 'ANODISED'.
But, I am unsure how this is indicated.

Can you help me to learn more?

(Another definition for anodised that I've seen is " Coated (aluminium)".)

I've seen this clue in The Hindu.
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