Crossword Genius

What king does with regulations (5)

Ross

I believe the answer is:

rules

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

'regulations' is the definition.
('rule' can be a synonym of 'regulation')

'what king does' is the wordplay.
I cannot quite understand how this works, but
'king' could be 'r' (abbreviation for rex, king in Latin) and 'r' is located in the answer.
The remaining letters 'ules' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'with' acts as a link.

Can you help me to learn more?

(Other definitions for rules that I've seen before include "governments" , "Reigns" , "Conventions" , "Is king" , "Governs; regulations" .)

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