My word is distorted by noisy and disorderly behaviour (8)
I believe the answer is:
rowdyism
'noisy and disorderly behaviour' is the definition.
(I've seen this before)
'my word is distorted' is the wordplay.
'distorted' indicates anagramming the letters.
'my'+'word'+'is'='mywordis'
'mywordis' is an anagram of 'ROWDYISM'.
'by' acts as a link.
(Other definitions for rowdyism that I've seen before include "Unruly behaviour" , "bad behaviour" , "yobbish behaviour" , "Noisy and disorderly behaviour" , "Disorderliness" .)