Crossword Genius

Rub city out for making acid? (7)

Ross

I believe the answer is:

butyric

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

'making acid?' is the definition.
'butyric' can be an answer for 'acid?' (butyric acid is a kind of acid). I am not sure about the 'making' bit.

'rub city out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'rub'+'city'='rubcity'
'rubcity' with letters rearranged gives 'BUTYRIC'.

'for' is the link.

Can you help me to learn more?

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