Two versions of one name (3)
I believe the answer is:
ian
'name' is the definition.
'two versions of one' is the wordplay.
'two versions of' becomes 'i' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'one' becomes 'an' (I've seen this in other clues).
'i'+'an'='IAN'
Can you help me to learn more?
(Other definitions for ian that I've seen before include "- Fleming (James Bond)" , "- Botham, cricketer" , "Scottish man's name" , "The familiar Mr Paisley" , "- McEwan, Eng. writer" .)