Cryptic crossword clue
One sailor and another with no joint is surprised, when taken 5

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

I've seen this crossword clue in Financial Times
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Buddy explains!

The straight part
We know that "is surprised, when taken" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case is surprised, when taken = aback.
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 ABACK mean?

ABACK adverb
  1. Towards the back or rear; backwards.
  2. In the rear; a distance behind.
  3. By surprise; startled; dumbfounded. (see usage)
  4. Backward against the mast; said of the sails when pressed by the wind from the "wrong" (forward) side, or of a ship when its sails are set that way.
ABACK noun
  1. An abacus.

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