Crossword Genius

King in regret about left meeting right (5)

Ross

I believe the answer is:

ruler

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'king' is the definition.
(I've seen this before)

'in regret about left meeting right' is the wordplay.
'in' indicates putting letters inside.
'regret' becomes 'rue' (synonyms).
'about left' becomes 'l' (common abbreviation. I am not sure about the 'about' bit.).
'meeting' is a charade indicator (letters next to each other).
'right' becomes 'r' (common abbreviation).
'rue' enclosing 'l' is 'rule'.
'rule'+'r'='RULER'

Can you help me to learn more?

(Other definitions for ruler that I've seen before include "Measuring strip" , "one responsible for a line?" , "One who holds sway and effects government" , "Head of state" , "Person in power - can draw a line" .)

I've seen this clue in The Sun.
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