Crossword Genius

Real grind (4)

Ross

I believe the answer is:

slog

(Other definitions for slog that I've seen before include "Walk hard carrying logs?" , "almighty wallop" , "big hit" , "Hit hard - hard work" , "Work doggedly" .)

I've seen this clue in the Wall Street Journal, the L.A. Times Daily, The New York Times and The Washington Post.
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