Crossword Genius

Asia fast in dismantling scam? That’s healthy (2,3,2,1,6)

Ross

I believe the answer is:

as fit as a fiddle

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

'asia fast' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'dismantling scam? that's healthy' is the wordplay.
'dismantling scam?' becomes 'as' (I can't explain this - if you can you should believe this answer much more).
'that's healthy' becomes 'fitasafiddle' (I've seen this in another clue).
'as'+'fitasafiddle'='AS FIT AS A FIDDLE'

'in' is the link.

Can you help me to learn more?

(Another definition for as fit as a fiddle that I've seen is " in form!".)

I've seen this clue in The Independent.
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