Coming out of one part of Dover, cutters can sink! (6)
I believe the answer is:
knives
'coming out of one part of dover cutters can sink' is the definition.
I can't tell whether this definition defines the answer.
'out of one part of dover cutters can sink' is the wordplay.
'out of' indicates putting letters inside (some letters on the outside of others).
'one part of dover cutters' becomes 've' (I can't justify this - if you can you should give a lot more credence to this answer).
'can' indicates anagramming the letters (I've seen 'canned' mean this (canned can mean drunk)).
'sink' anagrammed gives 'knis'.
've' placed inside 'knis' is 'KNIVES'.
Can you help me to learn more?
(Other definitions for knives that I've seen before include "Weapons" , "Cutting tools" , "Cutting implements" , "Cutters" , "Blades" .)