Road marker (4)

I think it could be either:

Which length description are you looking for?:

cone

'road marker' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for cone that I've seen before include "Circular pyramid" , "Tapering object" , "Tapering shape" , "Shape, the base is a circle and the sides taper up to a point" , "Volcano peak" .)

I've seen this clue in the Penny Press.

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