Before going out to do wrong, be destructive (5)
I believe the answer is:
erode
'do wrong be destructive' is the definition.
I can't tell whether this defines the answer.
'before going out' is the wordplay.
'before' becomes 'e' (I've seen this in other clues).
'going out' becomes 'rode' (I can't explain this - if you can you should give a lot more credence to this answer).
'e'+'rode'='ERODE'
'to' is the link.
Can you help me to learn more?
(Other definitions for erode that I've seen before include "Eat away" , "Gradually wear away" , "Become ground down or deteriorate" , "Corrode" , "Abrade" .)