Crossword Genius

Cup used at the Last Supper (5)

Ross

I believe the answer is:

grail

(Other definitions for grail that I've seen before include "Holy object of search" , "Chalice used by Jesus at the Last Supper" , "Famous chalice" , "The holy chalice used by Christ at the Last Supper" , "sought by Parsifal" .)

I've seen this clue in The Guardian.
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