Burn rebellious vigilantes after irritated Slav leaves (6)

I believe the answer is:

ignite

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'burn' is the definition.
(igniting is a kind of burning)

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

(Other definitions for ignite that I've seen before include "Burn" , "Catch fire; provoke" , "Detonate" , "'Set alight, fire up (6)'" , "Cause to catch fire" .)

I've seen this clue in The Hindu.

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