Stale joke involving tree (8)
I believe the answer is:
chestnut
I believe this clue is a double definition.
'stale joke' is the first definition.
(I've seen this before)
'tree' is the second definition.
(I know that chestnut is a type of tree)
'involving' acts as a link.
(Other definitions for chestnut that I've seen before include "Item for stuffing" , "Stale joke or cliche" , "Hunt sect behind a big tree" , "Reddish-brown colour" , "Laughably predictable" .)