Counterparts of cones (4)
I believe the answer is:
rods
'counterparts of cones' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rods that I've seen before include "Fishing sticks or canes" , "Hot ones are modified cars" , "Those angling" , "Thin sticks or staffs of office" , "Batons" .)