Feature a page penned by religious school (6)
I believe the answer is:
aspect
'feature' is the definition.
(feature can mean a quality or aspect of something)
'a page penned by religious school' is the wordplay.
'page' becomes 'p'.
'penned by' is an insertion indicator (inserted letters are penned in).
'religious school' becomes 'sect'.
'p' going inside 'sect' is 'spect'.
'a'+'spect'='ASPECT'
(Other definitions for aspect that I've seen before include "Characteristic to be considered" , "Look, panorama" , "Prospect, facet" , "Distant view of a wide area" , "Look; side of building" .)