The most common and most likely answer to this crossword clue is the 11 letter word TICKETY-BOO
I've seen this crossword clue in The Guardian
T
I
C
K
E
T
Y
-
B
O
O
More clues leading to the result TICKETY-BOO
Buddy explains!
The straight part
We know that "okay" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case okay = tickety-boo.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 TICKETY-BOO mean?
TICKETY-BOO adjective- Correct, satisfactory.