Cryptic crossword clue
Greek philosopher's man I reached when perplexed 11

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

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

The straight part
We know that "Greek philosopher's" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case greek philosopher's = archimedean.
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 ARCHIMEDEAN mean?

ARCHIMEDEAN adjective
  1. Of or pertaining to Archimedes.
  2. Having no infinitely large or infinitely small elements.

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