Brought over enough tasty clams, extracting innards with sharp tool (6)
I believe the answer is:
scythe
'tool' is the definition.
(scythe is a kind of tool)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for scythe that I've seen before include "Mowing instrument" , "Old mowing implement for hand use" , "Cut down - grass-cutting implement" , "Reaping implement" , "Old hand-held cutter of hay" .)