The most common and most likely answer to this crossword clue is the 10 letter word HIEROPHANT
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Buddy explains!

The straight part
We know that "Interpreter" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case interpreter = hierophant.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 HIEROPHANT mean?
HIEROPHANT noun- An ancient Greek priest who interpreted sacred mysteries, especially the priest of the Eleusinian mysteries.
- An interpreter of sacred mysteries or arcane knowledge.
- One who explains or makes a commentary.