The most common and most likely answer to this crossword clue is the 4 plus 5 letter word WELL TIMED
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More clues leading to the result WELL TIMED
Buddy explains!

The straight part
We know that "at the right moment" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case at the right moment = well timed.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 WELL TIMED mean?
WELL TIMED adjective- Happening at an opportune or advantageous time.
- Keeping accurate time.