The figure of a lamb bearing a cross or banner, emblematic of Christ (5,3)

I believe the answer is:

agnus dei

(Other definitions for agnus dei that I've seen before include "Part of Latin Mass" , "Christian emblem" , "'Latin mass prayer, Lamb of God (5,3)'" , "Latin liturgical prayer, Lamb of God" , "Part of the ordinary" .)

I've seen this clue in The Independent.

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