Murder rock group's rendition of Tutti Frutti ? (3,5)

I believe the answer is:

ice cream

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'group's rendition of tutti frutti ?' is the definition.
I can't tell whether this defines the answer.

'murder rock' is the wordplay.
'murder' becomes 'ice' (slang term).
'rock' becomes 'cream' (I can't explain this - if you can you should give a lot more credence to this answer).
'ice'+'cream'='ICE-CREAM'

Can you help me to learn more?

(Other definitions for ice cream that I've seen before include "dessert will appear" , "Dish" , "Gelato-like dessert" , "Party food" , "99, for example" .)

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