Long journey (4)

I believe the answer is:

trek

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

This is all the clue.

(Other definitions for trek that I've seen before include "Long and difficult trip" , "Footslog" , "Great journey" , "Long and difficult journey" , "Extended journey" .)

I've seen this clue in the Sydney Morning Herald, The Mirror, the USA Today, the LA Times, the Penny Press, The Independent, The Sunday Times, The Guardian, The Telegraph and the Evening Standard.

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