Separate cape rounded by unpopular revolutionary (6)

I believe the answer is:

detach

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'separate' is the definition.
(detaching is a kind of separating)

I don't understand the rest of the clue.

(Other definitions for detach that I've seen before include "Separate from, remove part" , "Disengage, unfasten" , "Disengage (something) and remove it" , "The reverse of 11 Down" , "Remove from something else, say a coupon" .)

I've seen this clue in The Guardian.

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