Where snooker player may put chalk when expected (2,3)
I believe the answer is:
on cue
'when expected' is the definition.
(I've seen this in another clue)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for on cue that I've seen before include "When signal given" , "When expected" , "One causing death" , "at the proper time" , "you can find chalk here" .)