Crossword Genius

Difficult journey on foot (4)

Ross

I believe the answer is:

trek

'difficult journey on foot' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for trek that I've seen before include "Long and difficult journey" , "Long walk, expedition" , "A long arduous walk" , "A long arduous journey as in S Africa" , "Long hard journey on foot" .)

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