Cool dish and ceramic plate's back requires spraying (3,5)

I believe the answer is:

ice cream

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

'cool dish' is the definition.
'ice cream' can be an answer for 'dish' (I've seen this before). I am not sure about the 'cool' bit.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for ice cream that I've seen before include "Creamy frozen confection, best in summer" , "Cold dessert" , "Dish" , "Sweet frozen foodstuff" , "Hot day treat" .)

I've seen this clue in The Independent.

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