River Thames at Oxford (4)

I believe the answer is:

isis

'river thames at oxford' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for isis that I've seen before include "Si, si - an Egyptian goddess" , "River Thames at Oxford" , "Revered figure" , "Mrs Osiris" , "Goddess of the rainbow" .)

I've seen this clue in The Telegraph and The Guardian.

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