A fir cone falls from this tree (7)
I believe the answer is:
conifer
'this tree' is the definition.
(conifer is a kind of tree)
'a fir cone falls' is the wordplay.
'falls' is an anagram indicator (I've seen 'fallen' mean this).
'fir'+'cone'='fircone'
'fircone' is an anagram of 'CONIFER'.
'from' acts as a link.
(Other definitions for conifer that I've seen before include "Type of tree" , "Tree such as pine, yew etc" , "Fir or pine, for example" , "Eg, pine, fir or cypress" , "In force (anag.)" .)