Old Testament vessel (3)
I believe the answer is:
ark
'old testament vessel' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ark that I've seen before include "Sacred chest" , "Noah's vessel - in which the Torah scrolls are kept" , "(E.g. poem) that tells a story" , "protection for couples that rose in bad weather" , "State" .)