The most common and most likely answer to this crossword clue is the 8 letter word PREDATED
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The straight part
We know that "Came earlier/ate" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case came earlier/ate = predated.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 PREDATED mean?
PREDATED verb- To designate a date earlier than the actual one; to move a date, appointment, event, or period of time to an earlier point (contrast "postdate".)
- To exist or to occur before something else; to antedate.
- To prey upon something.