Crossword Genius

Bad rule may become permanent (7)

Ross

I believe the answer is:

durable

'permanent' is the definition.
(thesaurus)

'bad rule may become' is the wordplay.
'may become' is an anagram indicator.
'bad'+'rule'='badrule'
'badrule' with letters rearranged gives 'DURABLE'.

(Other definitions for durable that I've seen before include "Lasting a long time" , "Likely to last" , "Made to last" , "Capable of lasting" , "Tough and long-wearing" .)

I've seen this clue in The Globe and Mail.
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