The most common and most likely answer to this crossword clue is the 6 plus 3 letter word FRENCH FRY
I've seen this crossword clue in The Times
F
R
E
N
C
H
F
R
Y
Buddy explains!
The straight part
We know that "Nice way to do the part of King Edward" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case nice way to do the part of king edward = french fry.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.