Extremely keen (4,2)

I think it could be either:

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4,2

gung ho

(Other definitions for gung ho that I've seen before include "Extremely enthusiastic" , "Stupidly jingoistic" , "Overly zealous" , "Very enthusiastic, keen as mustard" , "Over-zealous to gun hog down" .)

I've seen this clue in The Guardian.

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