Crossword Genius

Smooth, as wood (4)

Ross

I think it could be either:

Which length description are you looking for?:

4

5

plane

(Other definitions for plane that I've seen before include "Smooth" , "barked?" , "Nepal (anag.)" , "that soars into the sky" , "Form of transport" .)

I've seen this clue in The Wall Street Journal.
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