The most common and most likely answer to this crossword clue is the 9 letter word VORACIOUS
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More clues leading to the result VORACIOUS
Buddy explains!

The straight part
We know that "Ravenous" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ravenous = voracious.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 VORACIOUS mean?
VORACIOUS adjective- Wanting or devouring great quantities of food.
- Having a great appetite for anything (e.g., a voracious reader).