The Crossword Centre Clue-Writing Competition

CCCWC February competition voters’ comments
 
Clue no. 22: Emergency vessel made of lithium, iron, boron, oxygen, astatine.

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A clue to LIFEBOAT.
5 comments refer to this clue (from 5 competitors, 0 others)

Here is the text

Comments on the clue
1.Unlikely to be much use in an emergency!
2.A tad obvious
3.Sounds a bit poisonous to me!
4.I hope not – astatine is radioactive
5.Surface meaningless.