Cryptic crossword clue
Kills gaiety aboard ship 10

The most common and most likely answer to this crossword clue is the 10 letter word SLAUGHTERS

I've seen this crossword clue in Financial Times
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The straight part
We know that "Kills" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case kills = slaughters.
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.

Crossword Answer definitions

SLAUGHTERS verb
  1. To butcher animals, generally for food
  2. To massacre people in large numbers
  3. To kill in a particularly brutal manner

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