A king in control? Not in 1066! (6)

I believe the answer is:

harold

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'not in 1066' is the definition.
I can't judge whether this definition defines the answer.

'a king in control?' is the wordplay.
'king' becomes 'R' (abbreviation for rex, king in Latin).
'in' means one lot of letters goes inside another.
'control?' becomes 'hold' (hold is a kind of control).
'a'+'r'='ar'
'ar' put inside 'hold' is 'HAROLD'.

Can you help me to learn more?

(Other definitions for harold that I've seen before include "Man's name" , "King of England, January-October, 1066" , "Last Anglo-Saxon king of England" , "Battle of Hastings loser" , "King of England 1037-40" .)

I've seen this clue in The Sun.

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