Crossword Genius

Arduous journey (4)

Ross

I believe the answer is:

trek

'arduous journey' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for trek that I've seen before include "Long hike" , "Long hard journey on foot" , "A long arduous walk" , "Long walk in the mountains?" , "Long and difficult trip" .)

I've seen this clue in the Newsday, the LA Times, The New York Times, the Universal, The Wall Street Journal, the USA Today, The Telegraph, the King Feature Syndicate and The Guardian.
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