It's newly risen - from trees (5)
I believe the answer is:
resin
'from trees' is the definition.
I can't tell whether this defines the answer.
'it's newly risen' is the wordplay.
'it's newly' is an anagram indicator.
'risen' with letters rearranged gives 'RESIN'.
Can you help me to learn more?
(Other definitions for resin that I've seen before include "Substance produced from sap of some plants and trees" , "Cannabis, say" , "Sticky stuff as from pine tree" , "Elemi, for example" , "It exudes from pines" .)