Twin goddess? (4)
I believe the answer is:
isis
'twin goddess?' is the definition.
'isis' can be an answer for 'goddess?' (I've seen this before). I am not certain of the 'twin' bit.
'twin goddess?' is the wordplay.
'twin' indicates the doubling of some letters.
'goddess?' becomes 'is' (I can't explain this - if you can you should give a lot more credence to this answer).
'is' doubled is 'ISIS'.
Can you help me to learn more?
(Other definitions for isis that I've seen before include "Repetitive Egyptian goddess" , "Oxfordshire river" , "Part of river" , "Oxford river; goddess" , "Mrs Osiris" .)