The Crossword Centre Clue-Writing Competition

CCCWC March competition voters’ comments
 
Clue no. 31: Most obdurate coatings (8)

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A clue to A “GMT” word (Letters Latent).
2 comments refer to this clue (from 2 competitors, 0 others)

Here is the text

Comments on the clue
1.We need an explanation.
2.If the definitions stack up, it's a good clue.