24 across
Duck.
On
reflection,
20!
(2,5)
Duck. On reflection, 20! (2,5)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
In cricket, a Duck is a score of zero — hence NO SCORE. The wordplay builds it from "On" reversed (giving NO) followed by SCORE, which is another word for 20.