Crossword Genius

"Whatever piece of business you have in hand [. . .], do all the labor ____ it which can then be done” (Abraham Lincoln) (10,2)

Ross

I believe the answer is:

pertaining to

I've seen this clue in The Times.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.