On a horizontal plane (5)

I believe the answer is:

level

(Other definitions for level that I've seen before include "Standard" , "Straight, even" , "Storey - stage" , "Having a flat, horizontal surface" , "Staying at same height" .)

I've seen this clue in The Independent.

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.