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Alkie and son flogged quack medicine (5,3)

Ross

I believe the answer is:

snake oil

I'm a little stuck... Click here to teach me more about this clue!

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

'alkie and son flogged' is the wordplay.
'and' is a charade indicator (letters next to each other).
'flogged' indicates an anagram.
'alkie'+'son'='alkieson'
'alkieson' 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 Sydney Morning Herald.
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