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

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