Cryptic crossword clue
Right to ring head of faculty after answer relating to a Greek mathematician 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 Daily Telegraph
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Buddy explains!

The straight part
We know that "relating to a Greek mathematician" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case relating to a greek mathematician = 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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