Lose one's way in Rochester Road (3)

I believe the answer is:

err

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'lose one's way' is the definition.
I can't tell whether this definition defines the answer.

'in rochester road' is the wordplay.
'in' indicates a hidden word.
'ERR' can be found hidden inside 'rochester road'.

Can you help me to learn more?

(Other definitions for err that I've seen before include "Go astray" , "do something you shouldn't" , "Make mistakes" , "Deviate" , "Be inaccurate" .)

I've seen this clue in The Irish Independent.

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