The most common and most likely answer to this crossword clue is the 10 letter word CONFERENCE
I've seen this crossword clue in The Daily Telegraph
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More clues leading to the result CONFERENCE
- Group of sports clubs opposed to barrier restricting soldiers
- Fruit meeting the standard containing a number of additives
- Enforce reforms by November church synod?
- Meeting prisoner about to breach boundary
- Study military outfit defended by criminal in summit
- Meeting party joins monarch inside barrier
- Diet consisting of one pear?
Buddy explains!

The straight part
We know that "synod?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case synod? = conference.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 CONFERENCE mean?
CONFERENCE noun- The act of consulting together formally; serious conversation or discussion; interchange of views.
- A multilateral diplomatic negotiation.
- A formal event where scientists present their research results in speeches, workshops, posters or by other means.
- An event organized by a for-profit or non-profit organization to discuss a pressing issue, such as a new product, market trend or government regulation, with a range of speakers.
- A group of sports teams that play each other on a regular basis.
- A constituent tournament of a sports league in a given season.
- The act of comparing two or more things together; comparison.
- (Methodist Church) A stated meeting of preachers and others, invested with authority to take cognizance of ecclesiastical matters.
- A voluntary association of Congregational churches of a district; the district in which such churches are.
- To assess (a student) by one-on-one conversation, rather than an examination.