Crossword Genius

Super-keen (4,2)

Ross

I believe the answer is:

gung ho

(Other definitions for gung ho that I've seen before include "Stupidly jingoistic" , "Very (sometimes over-)enthusiastic and dedicated" , "Stupidly aggressive" , "Unthinkingly eager (to fight?)" , "Very enthusiastic, keen as mustard" .)

I've seen this clue in The Guardian.
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