Crossword Genius

Difficult journey (4)

Ross

I think it could be either:

slog

trek

(Other definitions for slog that I've seen before include "Very tiring work" , "Hit out without style" , "Work doggedly" , "Hit hard - hard work" , "Work (or walk) involving great effort" .)

I've seen this clue in the USA Today, The Telegraph, the Newsday, The Star Tribune, the Penny Press, The Daily Mail and The Independent.
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