Raced topless around Sinai Desert, otherwise walked (14)

I believe the answer is:

pedestrianised

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'raced topless' is the definition.
I can't judge whether this defines the answer.

'around sinai desert otherwise walked' is the wordplay.
'around' is an insertion indicator.
'otherwise' indicates anagramming the letters.
'walked' becomes 'ped' (I can't justify this - if you can you should believe this answer much more).
'sinai'+'desert'='sinaidesert'
'sinaidesert' with letters rearranged gives 'destrianise'.
'destrianise' inserted inside 'ped' is 'PEDESTRIANISED'.

Can you help me to learn more?

(Another definition for pedestrianised that I've seen is " with the wheels coming off".)

I've seen this clue in The Telegraph.

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