Surprising announcement by King worried about revolutionary record label (9)

I believe the answer is:

bookplate

I'm a little stuck... Click here to teach me more about this clue!

'label' is the definition.
(bookplate is a kind of label)

'surprising announcement by king worried about revolutionary record' is the wordplay.
I cannot really see how this works, but
'by' could be 'at' and 'at' is found within the answer.
'king' could be 'k' (chess abbreviation) and 'k' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for bookplate that I've seen is " Personal library label".)

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