Crossword Genius

Flat area suitable for an aircraft take-off? (5)

Ross

I believe the answer is:

plain

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'flat area' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for plain that I've seen before include "open country" , "Unadorned; evident" , "patent" , "Unattractive - flat" , "Unvarnished" .)

I've seen this clue in the Evening Standard.
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