The most common and most likely answer to this crossword clue is the 6 letter word ARREST
I've seen this crossword clue in Independent
A
R
R
E
S
T
More clues leading to the result ARREST
- Apprehend a wrongdoer at last, then relax
- Seize time for relaxation after a run
- Check artist’s standing with the others
- . Stop a bishop with half-cut priest
- Medical emergency caused by a speaker’s inactivity
- Nick needs spades to break overturned earth
- Grab a nap, having necked last of beer
- Apprehension remains after troops turned up
- Catch a break on radio
- Book by Sartre in translation
Buddy explains!

The straight part
We know that "Catch" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case catch = arrest.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 ARREST mean?
ARREST noun- A check, stop, an act or instance of arresting something.
- The condition of being stopped, standstill.
- The process of arresting a criminal, suspect etc.
- A confinement, detention, as after an arrest.
- A device to physically arrest motion.
- The judicial detention of a ship to secure a financial claim against its operators.
- Any seizure by power, physical or otherwise.
- A scurfiness of the back part of the hind leg of a horse.
- To stop the motion of (a person or animal).
- To stay, remain.
- To stop or slow (a process, course etc.).
- To seize (someone) with the authority of the law; to take into legal custody.
- To catch the attention of.
- To undergo cardiac arrest.