It's best to cover a piece of confectionery (5,4)

I believe the answer is:

cream cake

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'a piece of confectionery' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'it's best to cover' is the wordplay.
'it's best' becomes 'cream' (both can mean the elite).
'to cover' becomes 'cake' (caking is a kind of covering).
'cream'+'cake'='CREAM-CAKE'

Can you help me to learn more?

(Another definition for cream cake that I've seen is " Sweet high-calorie food".)

I've seen this clue in The Globe and Mail.

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