Teach me to twist the knife (7)
I believe the answer is:
machete
'knife' is the definition.
(I know that machete is a type of knife)
'teach me to twist' is the wordplay.
'to twist' indicates anagramming the letters (a twisted or distorted version of the letters).
'teach'+'me'='teachme'
'teachme' with letters rearranged gives 'MACHETE'.
'the' is the link.
(Other definitions for machete that I've seen before include "Heavy South American knife" , "Jungle blade" , "Broad heavy knife used in S America" , "hacker" , "cutter" .)