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 Guardian, the Penny Press, the Sydney Morning Herald, The Independent, the Evening Standard, the USA Today, The Sunday Times, the LA Times, The Mirror and The Telegraph.

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