Ring somebody at Kennington (4)

I believe the answer is:

oval

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'kennington' is the definition.
I can't tell whether this definition defines the answer.

'ring somebody' is the wordplay.
'ring' becomes 'o' (letter resembling a ring).
'somebody' becomes 'val' (I can't justify this - if you can you should believe this answer much more).
'o'+'val'='OVAL'

'at' is the link.

Can you help me to learn more?

(Other definitions for oval that I've seen before include "sports ground" , "6D 5A [TUBE STATION]" , "London cricket-ground" , "34 [CRICKETER] 's domain" , "not quite round" .)

I've seen this clue in the Evening Standard.

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