Crossword Genius

Sweet waffle, flipped over (4)

Ross

I believe the answer is:

sago

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'sweet' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'waffle flipped over' is the wordplay.
'waffle' becomes 'gas' (both can mean meaningless talk).
'flipped' says the letters should be written backwards.
'over' becomes 'o' (cricket abbreviation).
'gas' back-to-front is 'sag'.
'sag'+'o'='SAGO'

Can you help me to learn more?

(Other definitions for sago that I've seen before include "Edible palm starch" , "Cereal, used in pudding" , "Powdery starch used in cooking" , "Starchy foodstuff" , "Palm cereal" .)

I've seen this clue in The Sunday Times.
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