Answer: haveatit

AnswerCrossword Clue
HAVEATITBegin with enthusiasm
HAVEATIT"Dig in!"
HAVEATITDo battle
HAVEATITGet down to work, with gusto
HAVEATITGet started vigorously
HAVEATITMake the fur fly
HAVEATITDig in
HAVEATITAttack
HAVEATITWork with enthusiasm
HAVEATITGo mano a mano
HAVEATIT"You try!"
HAVEATITCome to blows