Cryptic crossword clue
They carry pigs and rats on boat, but not snake 8

The most common and most likely answer to this crossword clue is the 8 letter word TROTTERS

I've seen this crossword clue in Financial Times
T
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Buddy explains!

The straight part
We know that "They carry pigs" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case they carry pigs = trotters.
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 TROTTERS mean?

TROTTERS noun
  1. In harness racing, a horse with a gait in which the front and back legs on opposite sides take a step together alternating with the other set of opposite legs; as opposed to a pacer.
  2. The foot of a pig, sheep, or other quadruped.

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