Crossword Genius

A hero, hard yet shaky (5)

Ross

I believe the answer is:

rocky

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'shaky' is the definition.
(synonyms)

I cannot 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 "Characterised by large stones" , "Craggy; difficult" , "fighter making many comebacks" , "Uneven" , "'-' Marciano, US boxer" .)

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