A tree, you said? (3)
I believe the answer is:
yew
'a tree' is the definition.
(type of tree)
'you said?' is the wordplay.
'said?' shows a homophone (sound like).
'you' is a homophone of 'YEW'.
(Other definitions for yew that I've seen before include "Wood for archers" , "Tree associated with graveyards" , "Longbow wood" , "Wood for bows" , "Leaving body" .)