Crossword Genius

Check more unusual protective coating (6)


I believe the answer is:


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'protective coating' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'check more unusual' is the wordplay.
'check' becomes 'ch' (abbreviation).
'unusual' indicates an anagram.
'more' with letters rearranged gives 'rome'.

Can you help me to learn more?

(Other definitions for chrome that I've seen before include "Shiny metallic coating" , "Metallic element" , "'Silvery metal, resists tarnishing (6)'" , "shiny stuff" , "Decorative plating" .)

I've seen this clue in The Times.
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