Helps in a bad way (5)
I believe the answer is:
abets
'helps in a bad way' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for abets that I've seen before include "Assists in wrongdoing" , "Assists in crime" , "Aids and encourages" , "Helps (someone to commit crime)" , "Assists dealer, say" .)