Easy to see with no mountains in the way (5)

I believe the answer is:

plain

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'easy to see' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for plain that I've seen before include "not attractive" , "Simple - flatland" , "Unprepossessing" , "Simple, unadorned" , "Uncomplicated" .)

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