Articles about pie, say, in Samoa (4)
I believe the answer is:
apia
'in samoa' is the definition.
('Apia' is part of 'samoa')
'articles about pie' is the wordplay.
'articles' becomes 'aa' (two instances of 'a', the indefinite article).
'about' means one lot of letters goes inside another.
'pie' becomes 'pi' (I can't justify this - if you can you should believe this answer much more).
'aa' going around 'pi' is 'APIA'.
'say' acts as a link.
Can you help me to learn more?
(Other definitions for apia that I've seen before include "Capital of Samoa" , "Samoan port" , "Pacific capital" .)