Crossword Genius

Dull pattern of behaviour (3)

Ross

I believe the answer is:

rut

(Other definitions for rut that I've seen before include "Road depression, difficult to get out of" , "Boring groove to be stuck in!" , "Deep tyre track" , "Deep track or dull routine" , "Deep track or tedious way of life" .)

I've seen this clue in The Guardian.
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