The most common and most likely answer to this crossword clue is the 2 plus 1 plus 5 letter word IN A FLASH
I've seen this crossword clue in The Daily Telegraph
I
N
A
F
L
A
S
H
More clues leading to the result IN A FLASH
- Pub not closing before a half’s drunk very quickly
- How photograph in the dark is taken immediately?
- How bright idea may come to one
- Leaning towards the West, an island gets breaking news instantly
- Climax of competition starts late, remains fast
- How a bright idea may come to you?
- How brief announcement may be given on screen suddenly
- Relay final, remains to be seen immediately
- Where you could keep medicines, mostly to reach hospital quickly
- Quick learner in Isfahan dances
Buddy explains!
The straight part
We know that "How bright idea may come to one" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case how bright idea may come to one = in a flash.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.