Artificial language of someone older (3)
I believe the answer is:
neo
'artificial language' is the definition.
(artificial language created by Arturo Alfandari)
'of someone older' is the wordplay.
'of' indicates the answer is hidden within the clue.
'NEO' can be found hidden inside 'someone older'.
(Other definitions for neo that I've seen before include "language" , "Prefix meaning new of modern form of" , "Prefix meaning new or recent" , "Prefix meaning new - try one" , "Prefix meaning new, maybe one" .)