Crossword Genius

Rain shelter - for couples only? (5,3)

Ross

I believe the answer is:

noahs ark

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

'rain' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?

'shelter for couples only?' is the wordplay.
I cannot really understand how this works, but
'shelter' could be 'ark' (I have seen 'Ancient shelter' mean 'ark' so perhaps 'shelter' could also mean 'ark') and 'ark' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for noahs ark that I've seen before include "Biblical transport" , "animal transport" , "Biblical ship" , "Huge boat that withstood a great Flood" , "Great biblical boat" .)

I've seen this clue in The Irish Times.
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