Former King curtailing speech in Rivendell? (5)

I believe the answer is:

elvis

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'former king' is the definition.
'elvis' can be an answer for 'king' (I have seen 'The King' mean 'elvis' so perhaps 'king' could also mean 'elvis'). I am unsure of the 'former' bit.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for elvis that I've seen before include "The familiar R 'n'Roll king" , "Stop!" , "Mister Presley for one" , "'The King,' 50s pop idol" , "Mr Presley" .)

I've seen this clue in The Times.

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