Crossword Genius

Arduous trip (4)

Ross

I believe the answer is:

trek

'arduous trip' 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 "A long arduous march" , "Difficult journey on foot" , "Slog" , "A long arduous journey as in S Africa" , "A long arduous walk" .)

I've seen this clue in The Telegraph and The Sun.
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