Note thrushes flying around crown of coppiced tree (5,8)
I believe the answer is:
horse chestnut
'tree' is the definition.
(the horse chestnut is a kind of tree)
'note thrushes flying around crown of coppiced' is the wordplay.
'flying' indicates anagramming the letters (letters fly around into new positions).
'around' indicates putting letters inside.
'crown of' indicates taking the first letters.
The initial letter of 'coppiced' is 'c'.
'note'+'thrushes'='notethrushes'
'notethrushes' is an anagram of 'horsehestnut'.
'horsehestnut' enclosing 'c' is 'HORSE-CHESTNUT'.
(Other definitions for horse chestnut that I've seen before include "It bears fruit" , "Plant" , "Common British tree" , "Source of timber" , "seen in the woods" .)