Predator found game circling one river and another from the south (4,4)

'the south' is the definition.
Both the answer and definition are singular nouns.
Maybe you can see a link between them that I don't see?

'predator found game circling one river and another' is the wordplay.
I cannot really see how this works, but
'predator' could be 'wolf' and 'wolf' is present in the answer.
'river' could be 'r' (abbreviation) and 'r' is present in the answer.
The remaining letters 'gey' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'from' is the link.

Can you help me to learn more?