Crossword Genius

Involving much effort (9)

Ross

I believe the answer is:

strenuous

(Other definitions for strenuous that I've seen before include "requiring much effort" , "Very active" , "Hard" , "Laborious" , "with difficulty" .)

I've seen this clue in The Guardian.
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.