What the consumers don't want served in a restaurant? Outrageously - a stew! (4,5)

I believe the answer is:

food waste

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'what the consumers don't want served' is the definition.
I can't tell whether this definition defines the answer.

'restaurant? outrageously a stew' is the wordplay.
'restaurant?' becomes 'food' (I can't explain this - if you can you should give a lot more credence to this answer).
'outrageously' indicates anagramming the letters (I've seen this in other clues).
'a'+'stew'='astew'
'astew' with letters rearranged gives 'waste'.
'food'+'waste'='FOOD WASTE'

'in a' is the link.

Can you help me to learn more?

I've seen this clue in The Irish Times.

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