Cryptic crossword clue
Languages such as Hebrew, including old study of signs 9

The most common and most likely answer to this crossword clue is the 9 letter word SEMIOTICS

I've seen this crossword clue in The Guardian
S
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M
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Buddy explains!

The straight part
We know that "study of signs" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case study of signs = semiotics.
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 SEMIOTICS mean?

SEMIOTICS noun
  1. The study of signs and symbols, especially as means of language or communication.
  2. The study of medical signs and symptoms; symptomatology.

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