Check more unusual protective coating (6)
I believe the answer is:
chrome
'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'.
'ch'+'rome'='CHROME'
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" .)