Fruit of the pine tree (4)
I believe the answer is:
cone
'fruit of the pine tree' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for cone that I've seen before include "Volcanic peak" , "Geometric solid - fruit of pine" , "may obstruct lane" , "Hollow object associated with ice cream and motorways" , "Road works marker" .)