Crossword Genius

Royals upset northern woman (7)

Ross

I believe the answer is:

rosalyn

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

'woman' is the definition.

'royals upset northern' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'royals' is 'rosaly' which is within the answer.
'northern' could be 'n' (abbreviation e.g. N. Ireland) and 'n' is present in the answer.
No letters remain.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for rosalyn that I've seen is " Does this girl slay Ron?".)

I've seen this clue in The Telegraph.
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