William has an attempt at making butter (5,4)

I believe the answer is:

billy goat

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'butter' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'william has an attempt at' is the wordplay.
'william' becomes 'Billy'.
'has' means one lot of letters go next to another.
'an attempt' becomes 'go' (go is a kind of attempt).
'billy'+'go'+'at'='BILLY-GOAT'

'making' acts as a link.

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

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