Crossword Genius

Tough trek (4)

Ross

I believe the answer is:

slog

'tough trek' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for slog that I've seen before include "Work (or walk) involving great effort" , "Make a wild cricket stroke" , "big hit" , "almighty wallop" , "Very tiring work" .)

I've seen this clue in the New York Times, the Newsday.com and the Universal.
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