In truth, it's monotonous (3)

I believe the answer is:

rut

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'in truth it's monotonous' is the definition.
I can't tell whether this defines the answer.

'in truth it's monotonous' is the wordplay.
'in' indicates the answer is hidden within the clue.
'RUT' can be found hidden inside 'truth monotonous'.

Can you help me to learn more?

(Other definitions for rut that I've seen before include "hazard in the road" , "Settled routine" , "Furrow - dreary routine" , "Dull routine behaviour" , "Road depression, difficult to get out of" .)

I've seen this clue in the Evening Standard.

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