After even break, class is disrupted by rogues (7)
I believe the answer is:
rascals
'rogues' is the definition.
(I know this)
'after even break class is disrupted' is the wordplay.
'after' means one lot of letters go next to another.
'even' indicates alternate letters (even-numbered letters are used).
'is disrupted' is an anagram indicator.
The alternating letters of 'break' are 'ra'.
'class' with letters rearranged gives 'scals'.
'ra' put next to 'scals' is 'RASCALS'.
'by' acts as a link.
(Other definitions for rascals that I've seen before include "Scoundrels or naughty children" , "Mischievous or cheeky people" , "monkeys" , "Mischievous children" , "naughty boys?" .)