The most common and most likely answer to this crossword clue is the 0 letter word
More clues leading to the result AGREEMENT
- Green team working in harmony
- Consistency in contract
- Wave to entertaining guys after a concert
- Soldiers protected by a welcome treaty
- Workers secured by a welcome deal
- Alpha males engaged in welcome correspondence
- A chap carrying on with English male in Deal
- Contract aide initially to welcome outside people
- Meet with anger, after scrapping Concord
- . A salute with soldiers in harmony
Buddy explains!

The straight part
We know that "See 13A" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case see 13a = agreement.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.