Crossword Genius

Difficult trip (4)

Ross

I believe the answer is:

trek

'difficult 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 "Long walk, expedition" , "Great journey" , "A long hard march" , "Long difficult walk" , "Footslog" .)

I've seen this clue in the LA Times.
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