Clergyman drinks to idyllic musical works (10)

I believe the answer is:

pastorales

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'idyllic musical works' is the definition.
Although both the answer and definition are plural nouns, I can't understand how one could define the other.

'clergyman drinks' is the wordplay.
'clergyman' becomes 'pastor' (pastor is a kind of clergyman).
'drinks' becomes 'ales' (ale is a kind of drink).
'pastor'+'ales'='PASTORALES'

'to' is the link.

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I've seen this clue in the Sydney Morning Herald.

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