Ruled in absolute style (7)

I believe the answer is:

decided

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'ruled in absolute' is the definition.
'decided' can be an answer for 'absolute' (thesaurus). I am unsure of the 'ruled in' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for decided that I've seen before include "Made up one's mind" , "Determined; resolute" , "Indisputable" , "Unquestionable" , "Marked" .)

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