Crossword Genius

Lumire's partner and child (3)

Ross

I believe the answer is:

son

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

'child' is the definition.
(male child)

'lumire's partner and' is the wordplay.
I cannot really see how this works, but
'partner' could be 'so' (abbreviation for significant other) and 'so' is present in the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is located in the answer.
This accounts for all the letters.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for son that I've seen before include "Native" , "Male descendant" , "Express paper" , "Male child" , "Young boy" .)

I've seen this clue in The Times.
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