Going through here travelling: breakdown having missed parking sign (10)

I believe the answer is:

rehearsing

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'going through' is the definition.
(go through can mean to rehearse)

I don't understand the remainder of the clue.

(Other definitions for rehearsing that I've seen before include "Getting ready for the big night" , "getting ready for a show?" , "Practising (a play)" , "Preparing for a play" , "Trying out" .)

I've seen this clue in The Guardian.

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