The most common and most likely answer to this crossword clue is the 9 letter word OPPORTUNE
I've seen this crossword clue in The Guardian
O
P
P
O
R
T
U
N
E
More clues leading to the result OPPORTUNE
- Musical work opening shortly with melody that's suitable
- Convenient, 36 having time to penetrate mystic symbol
- Fit in drink with a Parisian after work …
- Suitable drink for consumption in old Indian city
- Suitable work left on board with a Parisienne
- Convenient being one up for review around harbour
- Happy pop fans or what they’re likely to be listening to
- Left in one up flying – lucky!
- Timely piano in poor composition and melody
- Convenient drink after work, one taken in brasserie?
Buddy explains!
The straight part
We know that "at appropriate time" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case at appropriate time = opportune.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 OPPORTUNE mean?
OPPORTUNE adjective- Suitable for some particular purpose.
- At a convenient or advantageous time.