Crossword Genius

Taproom doubled one's muddleheaded and offensive behaviour (9)

Ross

I believe the answer is:

barbarism

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

'offensive behaviour' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see an association between them that I can't see?

'taproom doubled one's muddleheaded' is the wordplay.
'taproom' becomes 'bar' (synonyms).
'doubled' shows that letters should be duplicated.
'one's' becomes 'i's' (Roman numeral).
'muddleheaded' becomes 'm' (this might be a standard abbreviation I've not previously seen).
'bar' doubled is 'barbar'.
'barbar'+'is'+'m'='BARBARISM'

'and' acts as a link.

Can you help me to learn more?

(Other definitions for barbarism that I've seen before include "Absence of culture and civilisation" , "Uncivilised nature" .)

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