The most common and most likely answer to this crossword clue is the 9 letter word PHARAONIC
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Buddy explains!
The straight part
We know that "related to some ancient Egyptian rulers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case related to some ancient egyptian rulers = pharaonic.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 PHARAONIC mean?
PHARAONIC adjective- Of or pertaining to a pharaoh.
- Impressively large or luxurious.
- Tyrannical or brutally oppressive.
- Of or pertaining to infibulation as a means of female genital mutilation.