Cryptic crossword clue
Stop boat leaking and one breaks bad luck? 5

The most common and most likely answer to this crossword clue is the 5 letter word CAULK

I've seen this crossword clue in The Guardian
C
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K

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The straight part
We know that "Stop boat leaking" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case stop boat leaking = caulk.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does CAULK mean?

CAULK noun
  1. A pointed projection on a horseshoe to prevent it slipping.
  2. A spike on the sole of a boot to prevent slipping, particularly used in logging
CAULK noun
  1. Caulking.
  2. A composition of vehicle and pigment used at ambient temperatures for filling/sealing joints or junctures, that remains elastic for an extended period of time after application.
CAULK verb
  1. To drive oakum into the seams of a ship's wooden deck or hull to make it watertight.
  2. To apply caulking to joints, cracks, or a juncture of different materials.
  3. Fuck

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