The Crossword Centre Clue-Writing Competition

CCCWC November competition voters’ comments
 
Clue no. 5: Arnie's bum cracks one that's plausibly deep in sound (9)

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A clue to SUBMARINE.
3 comments refer to this clue (from 3 competitors, 0 others)

Here is the text

Comments on the clue
1.Made me laugh and a cleverly disguised definition
2.Surface reading is nonsensical.
3.Cheeky but the unusual 'Arnie' rather gives away the anagram fodder and 'bum' is redundant to the colloquial surface story.