The most common and most likely answer to this crossword clue is the 3 plus 2 plus 1 plus 6 letter word ALL OF A SUDDEN
I've seen this crossword clue in The Guardian
A
L
L
O
F
A
S
U
D
D
E
N
More clues leading to the result ALL OF A SUDDEN
- Without warning disorder alas unfolded
- Reformed feudal land so abruptly
- Novel, alas, unfolded unexpectedly
- Everything on untidy sofa dude originally needed in a rush
- Very quickly lad found ales befuddling
- A line and leads found tangled, delivering shock?
- Unexpectedly as doleful and needing to change
- Everyone sounded upset about note out of the blue
- Unexpectedly, a lead unfolds dramatically
- Foul lads go berserk in a joint abruptly
Buddy explains!
The straight part
We know that "in a rush" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case in a rush = all of a sudden.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.