Of overseas origin, like Ian (5)
I believe the answer is:
'of overseas origin' is the definition.
The definition suggests a singular noun which matches the answer.
'like ian' is the wordplay.
'like' becomes 'as'.
Can you help me to learn more?
(Other definitions for asian that I've seen before include "Continental native" , "Of the largest continent" , "One from the East" , "One of eastern origin" , "Relating to one of the continents" .)