Kitty saved on car use etc going walkabout (6,3)

I believe the answer is:

rescue cat

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'kitty saved' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'car use etc going walkabout' is the wordplay.
'car use etc' can be anagrammed to 'RESCUE CAT'.
However, I'm not sure how this is indicated.

'on' is the link.

Can you help me to learn more?

I've seen this clue in The Independent.

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