Church vestment used in several baptisms (3)
I believe the answer is:
alb
'church vestment' is the definition.
(I've seen this before)
'in several baptisms' is the wordplay.
'in' indicates the answer is hidden within the clue.
'ALB' is hidden within 'several baptisms'.
'used' is the link.
(Other definitions for alb that I've seen before include "Priestly garment" , "Long white robe worn by Christian priest" , "White garment worn by priests" , "ecclesiastical garment" , "White linen liturgical vestment" .)