Cryptic crossword clue
Logical thinker helping with a nautical problem 11

The most common and most likely answer to this crossword clue is the 11 letter word RATIONALIST

I've seen this crossword clue in The Sunday Telegraph
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Buddy explains!

The straight part
We know that "Logical thinker" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case logical thinker = rationalist.
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 RATIONALIST mean?

RATIONALIST noun
  1. A person who follows the philosophy of rationalism

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