The cats and dogs season? (5)

I believe the answer is:

rains

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'season?' is the definition.
(I have seen 'Wet season' mean 'rains' so perhaps 'season' could also mean 'rains')

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for rains that I've seen before include "Falls in droplets" , "Comes down from cloud" , "Tropical wet season" , "Showers" .)

I've seen this clue in the Evening Standard.

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