The most common and most likely answer to this crossword clue is the 9 letter word CONCURRED
I've seen this crossword clue in The Guardian
C
O
N
C
U
R
R
E
D
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 = concurred.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 CONCURRED mean?
CONCURRED verb- To unite or agree (in action or opinion); to have a common opinion; to coincide; to correspond.
- To meet in the same point; to combine or conjoin; to contribute or help towards a common object or effect.
- To run together; to meet.
- To converge.