The Crossword Centre Clue-Writing Competition

CCCWC November competition voters’ comments
 
Clue no. 16: Cryptically a ‘number’ is something you take to go under

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A clue to SUBMARINE.
4 comments refer to this clue (from 3 competitors, 1 other)

Here is the text

Comments on the clue
1.Very good. Minor criticism is i’m not entirely convinced by the definition – do you “take” a submarine?
2.liked the surface's allusion to crossword clues!
3.Excellent. Really playing to the crowd with this clue!
4.One may go under anesthesia / an anaesthetic (but not, hopefully, take one to go under)