The most common and most likely answer to this crossword clue is the 8 letter word RESTYLED
I've seen this crossword clue in The Guardian
R
E
S
T
Y
L
E
D
More clues leading to the result RESTYLED
- Filthy location left amid tall grass given new appearance
- After recess, Tory right-wingers were at the helm
- Modified survey finally conducted after break
- Dirty place left covered with grass, transformed
- Engineers with dirty accommodation were first to be given new arrangement
- Relax--one of you was first with a new look
- Dump large grass skirts, getting made over
Buddy explains!

The straight part
We know that "de over" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case de over = restyled.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 RESTYLED mean?
RESTYLED verb- To refashion something in a new style or shape in order to fit another purpose.
- To give another name, designation or title to something.