Producer of Bond cutting introduction: it's rotten (4)
I believe the answer is:
poxy
'rotten' is the definition.
(I've seen this before)
'producer of bond cutting introduction' is the wordplay.
'producer of bond' becomes 'epoxy' (epoxy is a resin that forms a bond).
'cutting introduction' means to remove the first letter.
'epoxy' with its initial letter taken off is 'POXY'.
'it's' acts as a link.
(Other definitions for poxy that I've seen before include "Inferior" , "Rotten" , "drug extracted from synthetic resin" .)