Crossword Genius

What a possessive father calls his son? (2,3)

Ross

I believe the answer is:

my boy

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

'what a possessive father calls' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'son?' is the wordplay.
I cannot really understand how this works, but
'son?' could be 'boy' (synonyms) and 'boy' is found in the answer.
The remaining letters 'my' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'his' is the link.

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