The Crossword Centre Clue-Writing Competition

CCCWC March competition voters’ comments
 
Clue no. 4: Argon, helium and uranium refined here? No, oil is! (11)

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A clue to A “GMT” word (Letters Latent).
1 comment refers to this clue (from 1 competitor, 0 others)

Here is the text

Comments on the clue
1.Good but requires knowledge of Grangemouth (which I have!)