Cryptic crossword clue
Sailor stumped by stratagem hard to understand

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

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Buddy explains!

The straight part
We know that "hard to understand" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case hard to understand = abstruse.
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 ABSTRUSE mean?

ABSTRUSE adjective
  1. Difficult to comprehend or understand.
  2. Concealed or hidden out of the way; secret.

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