The Crossword Centre Clue-Writing Competition

CCCWC March competition voters’ comments
 
Clue no. 11: Formaldehyde is found in ocean! (8)

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A clue to SEAWATER.
4 comments refer to this clue (from 4 competitors, 0 others)

Here is the text

Comments on the clue
1.I can't imagine anyone ever solving this.
2.Expects too much of the solver
3.Not only clever, but also unique.
4.Very creative . Requires knowledge of chemistry though