Henry VI found Jack revolting! (4)

I believe the answer is:

cade

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'henry vi' is the definition.
Both the answer and definition are adjectives. Maybe there's an association between them I don't understand?

I don't understand the rest of the clue.

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(Other definitions for cade that I've seen before include "Jack -, Kentish rebel" , "Jack --, English rebel" , "Rebel leader" , "Barrel" .)

I've seen this clue in the Evening Standard.

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