Needles; stinging plants (7)
I believe the answer is:
nettles
I believe this clue is a double definition.
'needles' is the first definition.
('nettle' can be a synonym of 'needle')
'stinging plants' is the second definition.
(I've seen this before)
(Other definitions for nettles that I've seen before include "Irritates" , "Plants with stinging hairs" , "One acting Chief Inspector on TV" .)