River goddess in Egypt (4)

I believe the answer is:

isis

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This clue could be a double definition.

'river' is the first definition.
(term for the River Thames in Oxford)

'goddess in egypt' is the second definition.
'isis' can be an answer for 'goddess' (Egyptian god). I'm not sure about the 'in egypt' bit.

Can you help me to learn more?

(Other definitions for isis that I've seen before include "water" , "Egyptian goddess of nature" , "The upper Thames" , "Egyptian deity" , "Wife of Osiris" .)

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