Barbed spear (7)
I believe the answer is:
harpoon
'barbed spear' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for harpoon that I've seen before include "Lance" , "Spear used in hunting whales" , "Spear with a line attached for fishing" , "Whale-hunting spear" , "Whaler's weapon" .)