With perfect timing (2,3)
I believe the answer is:
on cue
'with perfect timing' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for on cue that I've seen before include "One causing death" , "at the perfect moment" , "Pat" , "Explanation as to how something might work" , "End up putting chalk here before break" .)