Filed from 3 published puzzles

ELBOWGREASE

Set to 3 different clues across 3 published puzzles, most often “Hard work” — The New York Times, Saturday, 2 October 2004.

11 letters

Every clue on record, most used first

Hard workonce
The New York Times — Saturday, 2 October 2004
Strong effort in cleaningonce
The New York Times — Tuesday, 9 May 2000
Extra effortonce
The New York Times — Sunday, 4 September 1994

Other answers to these clues

SWEAT5 letters
TOIL4 letters