Fellow punched by out-of-head public official in anger (7)

I believe the answer is:

dudgeon

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'anger' is the definition.
(dudgeon is a kind of anger)

I can't explain the remainder of the clue.

(Other definitions for dudgeon that I've seen before include "Umbrage" , "Sullenness" , "Devil's Disciple" , "Feeling of intense indignation" , "Offended indignation" .)

I've seen this clue in The Independent.

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