The most common and most likely answer to this crossword clue is the 7 letter word REWRITE
R
E
W
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I
T
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Buddy explains!

The straight part
We know that "Edit" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case edit = rewrite.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 REWRITE mean?
REWRITE noun- The act of writing again or anew.
- Something that has been written again.
- To write again, differently; to modify (a piece of writing or music, etc.).
- To write out again (without changes).