Crossword Genius

Numberless crafts that save life (5)

Ross

I believe the answer is:

rafts

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in The Irish News.
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