Answer: hasatit

AnswerCrossword Clue
HASATIT

Takes up the challenge

HASATIT

Dives into a project, say

HASATIT

Battles tooth and nail

HASATIT
Tackles the issue
HASATIT
Responds to "Knock yourself out!"
HASATITFights tooth and nail
HASATITGives 'er the old school try
HASATITGoes a few rounds
HASATITGets involved
HASATITAttacks
HASATITDives into a project
HASATITJoins the fray
HASATITAttacks a project vigorously
HASATITFights
HASATITGoes toe-to-toe
HASATITAttacks something