Cryptic crossword clue
They may be well defined as a “six-pack” 10

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

I've seen this crossword clue in Financial Times
A
B
D
O
M
I
N
A
L
S


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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 ABDOMINALS mean?

ABDOMINALS noun
  1. A fish of the order Abdominales.
  2. (usually plurale tantum) An abdominal muscle.

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