Long lasting rule, bad for a change (7)
I believe the answer is:
durable
'long lasting' is the definition.
(thesaurus)
'rule bad for a change' is the wordplay.
'for a change' is an anagram indicator.
'rule'+'bad'='rulebad'
'rulebad' anagrammed gives 'DURABLE'.
(Other definitions for durable that I've seen before include "Hardy" , "Capable of lasting" , "Lasting a long time" , "Good" , "Likely to last" .)