The most common and most likely answer to this crossword clue is the 3 plus 2 letter word LET UP
I've seen this crossword clue in The Guardian
L
E
T
U
P
More clues leading to the result LET UP
- Eastern European, it’s said, before court gets relief
- Stop grant at college
- Stop firsts from LSE, exposing those using phones
- Distracted lute player’s first to stop
- Relax and put up with the French first
- Relief gained by eastern European heard on horseback
- Stop the Alsatian approaching sheep
- Stopped Blue Peter broadcast short of brewing beer
- Grant at university came to an end
- Ease off the downward pressure?
Buddy explains!

The straight part
We know that "Stop" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case stop = let up.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 LET UP mean?
LET UP noun- A pause or period of slackening.