The most common and most likely answer to this crossword clue is the 9 letter word TRANSACTS
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More clues leading to the result TRANSACTS
Buddy explains!

The straight part
We know that "concludes" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case concludes = transacts.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 TRANSACTS mean?
TRANSACTS verb- To do, carry through, conduct or perform some action.
- To carry over, hand over or transfer something.
- To conduct business.
- To exchange or trade, as of ideas, money, goods, etc.