Noah's ship (3)
I believe the answer is:
ark
'noah's ship' is the definition.
(Noah's ark in the Bible)
This is all the clue.
(Other definitions for ark that I've seen before include "Noah's craft" , "Ship built by Noah" , "Biblical vessel" , "Boat built to withstand great flood" , "Noah's vessel - in which the Torah scrolls are kept" .)