Crossword Genius

Arduous journey (4)

Ross

I believe the answer is:

trek

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

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