The most common and most likely answer to this crossword clue is the 2 plus 3 letter word ON CUE
I've seen this crossword clue in Financial Times
O
N
C
U
E
More clues leading to the result ON CUE
- In the past guards united at the right time
- Copper brought in individual at the right moment
- Individual bringing in copper when required
- One short line that’s delivered at the right moment
- Formerly accommodating Unionist when required
- Somebody grabs copper at the perfect moment
- When you must get in? At the arranged time!
- Chalk here as indicated
- At the right moment put chalk here
- At the right time or at a former time touring university?
Buddy explains!
The straight part
We know that "At the arranged time" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case at the arranged time = on cue.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.