The most common and most likely answer to this crossword clue is the 8 letter word REFORMAT
R
E
F
O
R
M
A
T
More clues leading to the result REFORMAT
Buddy explains!
The straight part
We know that "Devise new layout" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case devise new layout = reformat.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 REFORMAT mean?
REFORMAT verb- To format anew or again, generally erasing a previous format.