Initials used as an `ialias^i (3)
I believe the answer is:
aka
'initials used' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'an 'ialiasi' is the wordplay.
'an' becomes 'a'.
''ialiasi' becomes 'ka' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'a'+'ka'='AKA'
'as' acts as a link.
Can you help me to learn more?
(Other definitions for aka that I've seen before include "Notation indicating alias or other name" , "Also called (abbrev.)" , "Notation indicating alternative name - palindrome" , "Also known as, initially" , "Notation indicating alternative identity" .)