Crossword Genius

Protectively coated adenoids malfunctioning (8)

Ross

I believe the answer is:

anodised

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

'adenoids malfunctioning' is the wordplay.
'malfunctioning' is an anagram indicator.
'adenoids' with letters rearranged gives 'ANODISED'.

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 Times.
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