Crossword Genius

Linear marking on the surface of Mars (5)

Ross

I believe the answer is:

canal

(Other definitions for canal that I've seen before include "Man-made channel of water" , "Artificial waterway for barges" , "Man-made waterway" , "Man-made watercourse" , "Artificial waterway as at Panama (5)" .)

I've seen this clue in The Telegraph.
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