Crossword Genius

Onion tonic did go well (2,4,9)

Ross

I believe the answer is:

in good condition

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

'onion tonic did go well' is the definition.
I can't judge whether this definition defines the answer.

'onion tonic did go well' is the wordplay.
'onion tonic did go' anagrams to 'IN GOOD CONDITION'.
Though, I am not sure how this is indicated.

Can you help me to learn more?

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