The most common and most likely answer to this crossword clue is the 9 letter word MEDIAEVAL
I've seen this crossword clue in The Daily Telegraph
M
E
D
I
A
E
V
A
L
Buddy explains!

The straight part
We know that "out of the Dark Ages" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case out of the dark ages = mediaeval.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 MEDIAEVAL mean?
MEDIAEVAL noun- Someone living in the Middle Ages.
- A medieval example (of something aforementioned or understood from context).
- Of or relating to the Middle Ages, the period from approximately 500 to 1500 AD.
- Having characteristics associated with the Middle Ages in popular, modern cultural perception: