Crossword Genius

Basic trail switches left to right (5)

Ross

I believe the answer is:

stark

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'basic' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

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(Other definitions for stark that I've seen before include "Blunt; grim" , "Severe in appearance" , "Severe looking; naked" , "Unclothed - unvarnished" , "Bleak" .)

I've seen this clue in The Guardian.
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