Crossword Genius

Bad rule surprisingly long-lasting (7)

Ross

I believe the answer is:

durable

'long-lasting' is the definition.
(synonyms)

'bad rule surprisingly' is the wordplay.
'surprisingly' is an anagram indicator (a surprising ordering of the letters).
'bad'+'rule'='badrule'
'badrule' is an anagram of 'DURABLE'.

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

I've seen this clue in The Daily Express.
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