Long difficult journey (4)

I believe the answer is:

trek

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

This is all the clue.

(Other definitions for trek that I've seen before include "Footslog" , "Difficult journey on foot" , "Long hike" , "Long walk, expedition" , "A long hard march" .)

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

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