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 know nothing about this answer so I can't judge whether it can be defined by this definition.

'son?' is the wordplay.
I cannot quite see how this works, but
'son?' could be 'boy' (synonyms) and 'boy' is present in the answer.
The remaining letters 'my' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'his' acts as a link.

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