The most common and most likely answer to this crossword clue is the 8 letter word COLLOQUY
C
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Buddy explains!
The straight part
We know that "mutual discourse" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case mutual discourse = colloquy.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 COLLOQUY mean?
COLLOQUY noun- A conversation or dialogue.
- A formal conference.
- A church court held by certain Reformed denominations.
- A written discourse.
- A discussion during a trial in which a judge ensures that the defendant understands what is taking place in the trial and what their rights are.
- To converse.