Keen character at the end showing envy after Judge departs (7)

I believe the answer is:

zealous

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'keen' is the definition.
(thesaurus)

I can't explain the rest of the clue.

(Other definitions for zealous that I've seen before include "Militant" , "Very devoted to a cause" , "Avidly enthusiastic" , "Intensely enthusiastic" , "Highly enthusiastic" .)

I've seen this clue in The Times.

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