Starts meter running -- shrewd (6-5)

I believe the answer is:

street smart

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'shrewd' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'starts meter running' is the wordplay.
'running' indicates an anagram.
'starts'+'meter'='startsmeter'
'startsmeter' with letters rearranged gives 'STREET-SMART'.

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I've seen this clue in The Telegraph.

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