Whatever happens, call toasts, silly! (2,3,5)

I believe the answer is:

at all costs

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

'whatever happens' is the definition.
I can't judge whether this defines the answer.

'call toasts silly' is the wordplay.
'silly' indicates an anagram.
'call'+'toasts'='calltoasts'
'calltoasts' anagrammed gives 'AT ALL COSTS'.

Can you help me to learn more?

(Other definitions for at all costs that I've seen before include "Regardless of the sacrifice involved" , "no matter what the consequences may be" , "Regardless of the price" , "Whatever the consequences" , "Regardless of expense" .)

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

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