Thespian's wish in acting, getting on after lucky opportunity (5,1,3)
I believe the answer is:
break a leg
'thespian's wish in acting' is the definition.
I can't judge whether this defines the answer.
'on after lucky opportunity' is the wordplay.
I cannot quite understand how this works, but
'on' could be 'leg' (cricket term) and 'leg' is found within the answer.
'opportunity' could be 'break' (I have seen 'Better opportunity' mean 'break' so perhaps 'opportunity' could also mean 'break') and 'break' is found in the answer.
A single letter 'a' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'getting' acts as a link.
Can you help me to learn more?
(Other definitions for break a leg that I've seen before include "Good luck in the theatre!" , "Good luck wish offered to actor in bleak rage" , "Do something that requires surgery" , "but not on the piste" , "leading to member being in cast?" .)