The most common and most likely answer to this crossword clue is the 6 letter word EMENDS
I've seen this crossword clue in The Daily Telegraph
E
M
E
N
D
S
More clues leading to the result EMENDS
- Workers restricted by editor’s changes
- Corrects aim in small spaces
- Reforms – some of them end satisfactorily
- Adjusts what cockney repairman does?
- Corrects this compiler over points
- Improves objectives to support half of them
- Changes send me bonkers
- Revises conclusions about Middle English
- Makes improvements to this writer in final bits
- Polishes pieces editor’s chosen for cover
Buddy explains!

The straight part
We know that "Improves" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case improves = emends.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 EMENDS mean?
EMENDS verb- To correct and revise (text or a document).