The most common and most likely answer to this crossword clue is the 8 letter word IRENICON
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The straight part
We know that "peace proposal" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case peace proposal = irenicon.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 IRENICON mean?
IRENICON noun- A proposition, scheme, or treatise designed to promote peace, especially in the church.
- The deacon's litany or great synapte at the beginning of the liturgy of the Orthodox Church.