King of Britain left off King of Georgia's middle name (5)

I believe the answer is:

uther

'king of britain' is the definition.
(legendary father of King Arthur)

'left off king of georgia's middle name' is the wordplay.
'left' becomes 'L' (common abbreviation).
'off' suggests deleting specific letters.
'king of georgia's middle name' becomes 'Luther' (Martin Luther King was from Georgia).
'luther' with 'l' taken away is 'UTHER'.

(Another definition for uther that I've seen is " ----- Pendragon, father of King Arthur".)

I've seen this clue in The Independent.

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