Article written by Channel island statesman? (5)
I believe the answer is:
iowan
'statesman?' is the definition.
(Iowa is a state)
'article written by channel island' is the wordplay.
'article' becomes 'an' (indefinite article).
'written by' is a charade indicator (letters next to each other).
'channel island' becomes 'iow' (Isle of Wight).
'an' put after 'iow' is 'IOWAN'.
(Other definitions for iowan that I've seen before include "Statesman" , "From a US state, capital Des Moines" , "From one US state" , "American" , "One from Des Moines perhaps" .)