Crossword Genius

Is an island in the Thames! (4)

Ross

I believe the answer is:

isis

'the thames' is the definition.

'is an island' is the wordplay.
'an island' becomes 'is'.
'is'+'is'='ISIS'

'in' is the link.

(Other definitions for isis that I've seen before include "Goddess of the rainbow" , "Oxford river; goddess" , "Oxfordshire river" , "Egyptian fertility goddess, mother of Horus" , "Revered figure" .)

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