Unstable movie hero? (5)
I believe the answer is:
rocky
'unstable' is the definition.
(similar in meaning)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for rocky that I've seen before include "Hard - unstable" , "likely to collapse" , "fighter making many comebacks" , "Uneven" , "Unstable - full of crags" .)