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A noted soporific (7)

Ross

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7

6,4

cradle song

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'a noted soporific' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

This is the entire clue.

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(Another definition for cradle song that I've seen is " Lullaby".)

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