Wicked threats ruin (7)
I believe the answer is:
shatter
'ruin' is the definition.
(I've seen this before)
'wicked threats' is the wordplay.
'wicked' indicates anagramming the letters.
'threats' anagrammed gives 'SHATTER'.
(Other definitions for shatter that I've seen before include "total" , "Support for broken arm" , "Break the minister into little pieces" , "Completely upset" , "Ruin" .)