Crossword Genius

Flat — level (5)

Ross

I believe the answer is:

plane

I believe this is a double definition.

'flat' is the first definition.
(I know that flat can be written as plane)

'level' is the second definition.
(I know that plane is a type of level)

(Other definitions for plane that I've seen before include "Smoother" , "Tree - figure - aircraft" , "Smooth" , "Form of transport" , "Nepal (anag.)" .)

I've seen this clue in The Guardian.
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