One left his anorak after scrambling for rescue boat (5,3)

I believe the answer is:

noahs ark

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'rescue boat' is the definition.
'noahs ark' can be an answer for 'boat' (I have seen 'Biblical boat ' mean 'noahs ark' so perhaps 'boat' could also mean 'noahs ark'). I am not sure about the 'rescue' bit.

'one left his anorak after scrambling' is the wordplay.
'one' becomes 'I' (Roman numeral).
'left' suggests deleting specific letters.
'after scrambling' indicates an anagram.
'his'+'anorak'='hisanorak'
'hisanorak' with 'i' taken away is 'hsanorak'.
'hsanorak' with letters rearranged gives 'NOAHS ARK'.

'for' is the link.

Can you help me to learn more?

(Other definitions for noahs ark that I've seen before include "Hebrew patriarch's vessel" , "Great biblical boat" , "It landed on Ararat" , "Biblical ship" , "Biblical transport" .)

I've seen this clue in The Guardian.

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