Right inside baptismal bowl, a large hanging drapery (7)
I believe the answer is:
frontal
'hanging drapery' is the definition.
(decorative cloth in a church)
'right inside baptismal bowl a large' is the wordplay.
'right' becomes 'r' (common abbreviation).
'inside' is an insertion indicator.
'baptismal bowl' becomes 'font' (I've seen this before).
'large' becomes 'L' (eg in clothes sizes).
'r' put inside 'font' is 'front'.
'front'+'a'+'l'='FRONTAL'
(Other definitions for frontal that I've seen before include "Forward" , "Relating to the forehead" , "Decorative church item" , "Altar hanging" , "Directly approaching" .)