AH! Enter it, coming back with an Asian citizen (4)
I believe the answer is:
thai
'an asian citizen' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'ah enter it coming back' is the wordplay.
'enter' indicates putting letters inside.
'coming back' says the letters should be written in reverse.
'ah' going inside 'it' is 'iaht'.
'iaht' written backwards gives 'THAI'.
'with' is the link.
Can you help me to learn more?
(Other definitions for thai that I've seen before include "countryman" , "Sort of massage" , "Person from Bangkok?" , "Citizen of the country once known as Siam" , "Morte d'16author" .)