The most common and most likely answer to this crossword clue is the 10 letter word COURTROOMS
I've seen this crossword clue in The Daily Telegraph
C
O
U
R
T
R
O
O
M
S
More clues leading to the result COURTROOMS
Buddy explains!

The straight part
We know that "Venues where one’s tried" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case venues where one’s tried = courtrooms.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 COURTROOMS mean?
COURTROOMS noun- The room where a judge presides over hearings and trials, sometimes with a jury.