Crossword Genius

Wild kale is no good for those who want a silly panacea (5,3)

Ross

I believe the answer is:

snake oil

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'good for those who want a silly panacea' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'wild kale is no' is the wordplay.
'wild' indicates an anagram.
'kale'+'is'+'no'='kaleisno'
'kaleisno' is an anagram of 'SNAKE-OIL'.

Can you help me to learn more?

(Other definitions for snake oil that I've seen before include "this won't make things better" , "Miracle cure" , "Liquid sold as medicine but medically worthless" .)

I've seen this clue in The Irish Times.
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