My word! Is criminal creating such bad behaviour (8)

I believe the answer is:

rowdyism

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'bad behaviour' is the definition.
(I've seen this before)

'my word is criminal' is the wordplay.
'criminal' indicates an anagram.
'my'+'word'+'is'='mywordis'
'mywordis' anagrammed gives 'ROWDYISM'.

'creating such' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for rowdyism that I've seen before include "Noisy and disorderly behaviour" , "yobbish behaviour" , "bad behaviour" , "Disorderliness" , "Unruly behaviour" .)

I've seen this clue in The Irish Times.

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