Hardly a lead actor's ‘bye (5)
I believe the answer is:
extra
''bye' is the definition.
(I have seen 'A bye' mean 'extra' so perhaps 'bye' could also mean 'extra')
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for extra that I've seen before include "Small part actor" , "spotted at rear of the platoon?" , "Minor person screened" , "No-ball or wide, perhaps?" , "Another" .)