Crossword Genius

Long arduous journey (4)

Ross

I believe the answer is:

trek

'long 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 "A long arduous walk" , "Long hike" , "Long hard journey on foot" , "Long walk in the mountains?" , "Extended journey" .)

I've seen this clue in The Guardian and The Times.
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