Crossword Genius

The family man most likely to succeed (6,3)

Ross

I believe the answer is:

eldest son

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

'most likely to succeed' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'the family man' is the wordplay.
I cannot quite understand how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found within the answer.
'man' could be 'son' and 'son' is located 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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