Crossword Genius

Relentless grind (3)

Ross

I believe the answer is:

rut

(Other definitions for rut that I've seen before include "Furrow made by wheels" , "Dull routine behaviour" , "deer find it exciting" , "A deep track - get out of it" , "Furrow - dreary routine" .)

I've seen this clue in the Universal.
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