Crossword Genius

Arduous journey (4)

Ross

I believe the answer is:

trek

'arduous journey' is the definition.
(I've seen this in another clue)

This is the entire 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 Universal, the Newsday, the King Feature Syndicate, The New York Times, The Wall Street Journal, The Telegraph, The Guardian, the LA Times and the USA Today.
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