Crossword Genius

Dictator's rival with talent for reasonableness (9)

Ross

I believe the answer is:

viability

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'reasonableness' is the definition.
The answer and definition can be both human attributes as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'dictator's rival with talent' is the wordplay.
'dictator's rival' becomes 'vi' (I am not sure about this - if you are sure you should believe this answer much more).
'with' says to put letters next to each other.
'talent' becomes 'ability' (I've seen this in another clue).
'vi'+'ability'='VIABILITY'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for viability that I've seen before include "likelihood of success" , "Aptitude for living" .)

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