The most common and most likely answer to this crossword clue is the 6 letter word GLYCOL
I've seen this crossword clue in The Daily Telegraph
G
L
Y
C
O
L
More clues leading to the result GLYCOL
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The cryptic/wordplay part
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What does GLYCOL mean?
GLYCOL noun- Any aliphatic diol.
- A thick, colourless liquid, C2H4(OH)2, of a sweetish taste, produced artificially from certain ethylene compounds and used as an antifreeze; ethylene glycol.