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Ardent Green wants change of leader (7)

Ross

I believe the answer is:

zealous

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'ardent' is the definition.
(synonyms)

I cannot understand how the remainder of the clue works.

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(Other definitions for zealous that I've seen before include "Very devoted to a cause" , "Extremely enthusiastic" , "'Enthusiastic, keen (7)'" , "Ardently active" , "Highly enthusiastic" .)

I've seen this clue in The Sun.
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