A smoother means of travel (5)

I believe the answer is:

plane

I'm a little stuck... Click here to teach me more about this clue!

'a smoother' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

(Other definitions for plane that I've seen before include "Nepal (anag.)" , "that soars into the sky" , "Woodworker's tool" , "barked?" , "Flat surface; tree" .)

I've seen this clue in The Irish 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.