Infuriates leaderless forest officials (6)

I believe the answer is:

angers

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

'infuriates' is the definition.
(I've seen this before)

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

(Other definitions for angers that I've seen before include "annoys" , "Outrages" , "Maine city" , "Maddens" , "French city" .)

I've seen this clue in The Guardian.

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