Carpenter's tool with a bubble (5)

I believe the answer is:

level

(Other definitions for level that I've seen before include "Palindromic tier?" , "Palindromically smooth" , "Tier; calm and steady" , "Floor; horizontal" , "Smooth - sort of crossing" .)

I've seen this clue in the USA Today.

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.