Destroy putting stick through heart (7)
I believe the answer is:
corrode
'destroy' is the definition.
(I've seen this before)
'stick through heart' is the wordplay.
'stick' becomes 'rod' (I've seen this before).
'through' indicates putting letters inside (inserted letters go through the word).
'heart' becomes 'core' (synonyms).
'rod' inserted within 'core' is 'CORRODE'.
'putting' acts as a link.
(Other definitions for corrode that I've seen before include "Growth in hazel buds" , "Chemically weaken" , "Gradually eat away" , "Eg, to rust" , "Gradually weaken (metal)" .)