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Don sat, cardigan’s spoilt, going to be terribly wet (4,4,3,4)

Ross

I believe the answer is:

rain cats and dogs

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

'be terribly wet' is the definition.
I can't tell whether this defines the answer.

'don sat cardigan's spoilt' is the wordplay.
'spoilt' indicates anagramming the letters.
'don'+'sat'+'cardigans'='donsatcardigans'
'donsatcardigans' is an anagram of 'RAIN CATS AND DOGS'.

'going to' acts as a link.

Can you help me to learn more?

(Other definitions for rain cats and dogs that I've seen before include "To fall heavily" , "come down hard" , "bucket" , "Pour" , "Pelt" .)

I've seen this clue in the Sydney Morning Herald.
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