The most common and most likely answer to this crossword clue is the 9 letter word ANTEDATED
I've seen this crossword clue in The Guardian
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More clues leading to the result ANTEDATED
Buddy explains!

The straight part
We know that "placed in an earlier time" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case placed in an earlier time = antedated.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 ANTEDATED mean?
ANTEDATED verb- To occur before an event or time; to exist further back in time.
- To assign a date to a document or action earlier than the actual date; to backdate.
- To find earlier citational evidence for a term.