Clerical robes (4)
I believe the answer is:
albs
'clerical robes' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for albs that I've seen before include "Long white robes worn by priests" , "White liturgical vestment" , "Slab (anag.)" , "White linen liturgical vestments" .)