Pamper in shower? On the contrary, stupid! (7-7)

I believe the answer is:

washing machine

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'the contrary stupid' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'pamper in shower? on' is the wordplay.
'pamper in' becomes 'machine' (I am not sure about this - if you are sure you should believe this answer much more).
'shower?' becomes 'washing' (shower is a kind of washing).
'on' means one lot of letters go next to another.
'machine' put after 'washing' is 'WASHING-MACHINE'.

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I've seen this clue in The Times.

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