Ringing approximately at (5,5)

I believe the answer is:

round about

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'at' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'ringing approximately' is the wordplay.
'ringing' becomes 'round' (I am not sure about this - if you are sure you should believe this answer much more).
'approximately' becomes 'about' (synonyms).
'round'+'about'='ROUND ABOUT'

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I've seen this clue in the Evening Standard.

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