Plant article America's written about China (7)
I believe the answer is:
anchusa
'plant' is the definition.
(anchusa is a kind of plant)
'article america's written about china' is the wordplay.
'article' becomes 'an' (indefinite article).
'america' becomes 'usa' (United States of America).
'written about' means one lot of letters goes inside another.
'china' becomes 'ch'.
'an'+'usa'='anusa'
'anusa' enclosing 'ch' is 'ANCHUSA'.
(Other definitions for anchusa that I've seen before include "Hairy flower" , "borage-type plant" .)