A gender neutral person's article on Iran (5)
I believe the answer is:
their
'a gender neutral person's' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'article on iran' is the wordplay.
'article' becomes 'the' (the 'definite article' part of speech).
'on' means one lot of letters go next to another.
'iran' becomes 'ir' (eg in website addresses).
'the'+'ir'='THEIR'
(Other definitions for their that I've seen before include "Possessive pronoun" , "Some would say his (or her)" , "Those people's" , "belonging to an individual" , "Belonging to those people" .)