Article on Pacific island country featured in excellent publication (7)
I believe the answer is:
fanzine
'excellent publication' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'article on pacific island country featured in' is the wordplay.
'article' becomes 'a' (the indefinite article in English).
'on' means one lot of letters goes inside another.
'pacific island' becomes 'fine' (I can't justify this - if you can you should believe this answer much more).
'country' becomes 'nz' (abbreviation for New Zealand).
'featured in' indicates putting letters inside.
'a' inserted within 'fine' is 'faine'.
'faine' placed around 'nz' is 'FANZINE'.
Can you help me to learn more?
(Other definitions for fanzine that I've seen before include "Magazine for admirers of, say, football team" , "Magazine for addicts or supporters" , "buff periodical?" , "Enthusiasts' magazine" , "Publication by and for amateur enthusiasts" .)