Crossword Genius

Ruthless daily grind at a mundane line? (3)

Ross

I believe the answer is:

rut

I'm a little stuck... Click here to teach me more about this clue!

'ruthless daily grind' is the definition.
'rut' can be an answer for 'grind' (thesaurus). I'm not certain of the 'ruthless daily' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for rut that I've seen before include "It can be frustrating" , "mate" , "Deep tyre track" , "Deep groove as in a lane" , "Deep vehicle track" .)

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