The most common and most likely answer to this crossword clue is the 4 plus 3 letter word EASE OFF
I've seen this crossword clue in The Times
E
A
S
E
O
F
F
More clues leading to the result EASE OFF
- Moderate teases toffs endlessly
- Weight finally taken off feet, sofa designed to relax
- Tablets not working by the sound of it — get less
- Calm down, please: official’s inside
- Stand briefly by side of cricket pitch to relax
- Stormy sea, with retreating enemy initially forced to relent
- Cease offending, dismissing outsiders — relax a bit!
- Only some cease offending and become less intense
- Moderate FA fines after drugs report?
- We hear cockney bloke’s going to relax
Buddy explains!

The straight part
We know that "get less" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case get less = ease off.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.