The most common and most likely answer to this crossword clue is the 5 plus 5 letter word GREEN LIGHT
I've seen this crossword clue in The Guardian
G
R
E
E
N
L
I
G
H
T
More clues leading to the result GREEN LIGHT
- What one has to go on is fresh and amusing
- Briefing, ultimately lengthier, could give us something to go on
- Inexperienced and unimportant? Okay
- Sanction naïve understanding
- What makes racy type on pole put her foot down?
- Land with inexperienced leader is OK
- Go-ahead for environmentalist not serious?
- Something to make one go?
- Signal given by fire on common
- Environment-friendly Kindle gets go-ahead
Buddy explains!
The straight part
We know that "OK" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ok = green light.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 GREEN LIGHT mean?
GREEN LIGHT verb- To approve; to permit to proceed.