Answer: eagerbeaver

AnswerCrossword Clue
EAGERBEAVERGo-getter
EAGERBEAVEROverly diligent sort
EAGERBEAVEROverzealous one: Slang.
EAGERBEAVERArdent rookie.
EAGERBEAVERDiligent one.
EAGERBEAVEREnthusiast
EAGERBEAVERGung-ho type