Panes smashed in Poplar (5)
I believe the answer is:
aspen
'poplar' is the definition.
(aspen is a kind of poplar)
'panes smashed' is the wordplay.
'smashed' is an anagram indicator.
'panes' with letters rearranged gives 'ASPEN'.
'in' is the link.
(Other definitions for aspen that I've seen before include "Tree that quivers" , "Tree with shivering leaves" , "Trembling poplar tree" , "Growth" , "ski resort in America?" .)