Crossword Genius

Be very keen to act (5,2,3,3)

Ross

I believe the answer is:

champ at the bit

(Other definitions for champ at the bit that I've seen before include "Be eager to begin" , "Be impatient to start" , "Show impatience to act" , "can't wait!" , "Wait impatiently for something to begin" .)

I've seen this clue in the Sydney Morning Herald.
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