Crossword Genius

Unstable movie hero? (5)

Ross

I believe the answer is:

rocky

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'unstable' is the definition.
(similar in meaning)

I don't understand how the remainder of the clue works.

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(Other definitions for rocky that I've seen before include "Hard - unstable" , "likely to collapse" , "fighter making many comebacks" , "Uneven" , "Unstable - full of crags" .)

I've seen this clue in the Evening Standard.
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