Crossword Genius

He succeeds where all others fail (4,4)

Ross

I believe the answer is:

sole heir

I'm a little stuck... Click here to teach me more about this clue!

'succeeds where all others fail' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'he' is the wordplay.
I cannot quite see how this works, but
'he' could be 'sol' and 'sol' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Globe and Mail.
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