Panes smashed by tree (5)
I believe the answer is:
aspen
'tree' is the definition.
(aspen is a kind of tree)
'panes smashed' is the wordplay.
'smashed' indicates an anagram.
'panes' with letters rearranged gives 'ASPEN'.
'by' is the link.
(Other definitions for aspen that I've seen before include "somewhere in Colorado" , "city in Colorado" , "Its leaves flutter in the slightest breeze" , "that's wooden" , "Type of poplar" .)