Long hard journey (4)

I believe the answer is:

trek

'long hard journey' 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 "Extended journey" , "Long walk, expedition" , "Great journey" , "Difficult journey on foot" , "Long hard journey on foot" .)

I've seen this clue in The Times, The Telegraph, the USA Today, the Universal and the New York Times.

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