Traffic markers (5)
I believe the answer is:
cones
'traffic markers' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for cones that I've seen before include "Shapes with circular base and tapering sides" , "Round shapes with tapering sides" , "They taper from a circular base to a point" , "Dry fruits of evergreen trees" , "Ice-cream holders or fruits of pine trees" .)