Set of type used for baptism (4)
I believe the answer is:
font
I believe this is a double definition.
'set of type' is the first definition.
(I've seen this in another clue)
'baptism' is the second definition.
(thesaurus)
'used for' is the link.
(Other definitions for font that I've seen before include "Baptismal receptacle" , "Style of lettering" , "Gothic" , "Baptismal basin" , "Vessel for baptismal water" .)