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

The straight part
We know that "agreed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case agreed = coincided.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 COINCIDED mean?
COINCIDED verb- To occupy exactly the same space.
- To occur at the same time.
- To correspond, concur, or agree.