Conker (5,8)
I believe the answer is:
horse chestnut
'conker' is the definition.
(I know that conker can be written as horse chestnut)
This is all the clue.
(Other definitions for horse chestnut that I've seen before include "seen in the woods" , "Plant" , "inedible fruit" , "Tree with conkers" , "Could one be felled like a log" .)