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Monotonous, but it could be considered groovy (3)

Ross

I believe the answer is:

rut

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'it could be considered groovy' is the definition.
The definition suggests a singular noun which matches the answer.

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(Other definitions for rut that I've seen before include "hazard in the road" , "Monotony that's hard to escape" , "It can be frustrating" , "predictable course" , "Deep track or dull routine" .)

I've seen this clue in the Evening Standard.
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