Numberless crafts that save life (5)
I believe the answer is:
rafts
'save life' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'numberless crafts' is the wordplay.
'RAFTS' is hidden within the letters.
But, I am not sure how this is indicated.
'that' is the link.
Can you help me to learn more?
(Other definitions for rafts that I've seen before include "Flat boats" , "Flat, floating platforms" , "Flat floats" , "Flat floating structures" .)