Toiled

5 clues
Worked
Worked hard
Plugged away
Worked like a dog
Put one's nose to the grindstone
Similar answers:
Abattoir
Abattoirs
Abled
Abnerdoubleday
Abnersingleday
Aboutazoofilledwith
Abseiled
Acknowledge
Addinsulttoinjury
Addled
Addledadoublelife
Addledanormallife
Addledbrains
Adeledazeem
Adoubledactyl
Afishcalledw
Afishcalledwanda
Ahugelandlierevealed
Ailed
Aircooled