Carry-On cast (5)
I believe the answer is:
fling
This clue might be a double definition.
'carry-on' is the first definition.
Both the definition and answer are singular nouns.
Maybe there's an association between them I don't understand?
'cast' is the second definition.
(both can mean to throw)
Can you help me to learn more?
(Other definitions for fling that I've seen before include "Brief affair; throw" , "good time" , "quick one?" , "Throw; Scottish dance" , "See 7" .)