Lives a double life as a goddess (4)

I believe the answer is:

isis

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'goddess' is the definition.
(Egyptian god)

'lives a double' is the wordplay.
'lives' becomes 'is' ('be' can be a synonym of 'live').
'a double' indicates the doubling of some letters.
'is' doubled is 'ISIS'.

'life as a' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for isis that I've seen before include "Revered figure" , "To be, to be an Egyptian goodess" , "Part of river" , "Sister of Osiris" , "Si Si - she's an Egyption goddess" .)

I've seen this clue in the Evening Standard.

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