Tract having articles about religious education (4)
I believe the answer is:
area
'tract' is the definition.
(I've seen this before)
'articles about religious education' is the wordplay.
'articles' becomes 'aa' (I've seen this in other clues).
'about' is an insertion indicator.
'religious education' becomes 're'.
'aa' going around 're' is 'AREA'.
'having' acts as a link.
(Other definitions for area that I've seen before include "Region, zone" , "Region; extent of a surface" , "Expanse or neighbourhood" , "Field -- expanse" , "District; locale" .)