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

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