Impales (6)
I believe the answer is:
spears
'impales' is the definition.
(spearing is a kind of impaling)
This is the entire clue.
(Other definitions for spears that I've seen before include "Pointed stems of asparagus" , "Javelins" , "Bits of green veg" , "Some broccoli" , "Asparagus shoots" .)