A loose wide-sleeved liturgical vestment worn over the cassock by clergymen, choristers and acolytes (8)

I believe the answer is:

surplice

(Other definitions for surplice that I've seen before include "White vestment worn over a cassock" , "I scruple to wear priestly garment" , "Clerical or choral garment" , "White gown worn over a cassock" , "gear" .)

I've seen this clue in The Independent.

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