The most common and most likely answer to this crossword clue is the 9 letter word TRAMLINES
I've seen this crossword clue in Financial Times
T
R
A
M
L
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More clues leading to the result TRAMLINES
- Court limits liberation of men with trials
- Tracks a minstrel’s playing?
- Rigid principles for the running of public transport
- A minstrel going off the rails
- A court may have such rigid principles
- Managed terminals in court’s boundaries
- Tracks and terminals under repair
- Markings on court order for men's trial
- Couples in court have final decrees after terminal allocation
Buddy explains!

The straight part
We know that "A court may have such/rigid principles" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a court may have such/rigid principles = tramlines.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 TRAMLINES mean?
TRAMLINES noun- The rails that a tram runs on.
- Either of the two pairs of sidelines marked on a tennis court which mark the outside of the singles and doubles playing areas.
- A scratch on a film, usually vertical, that extends through multiple frames.