Deciduous tree (3)
(Other definitions for oak that I've seen before include "Tree of the genus Quercus" , "The mighty tree" , "Strong hardwood" , "Acorn-bearing tree" , "Grown acorn" .)
'deciduous tree' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for elm that I've seen before include "Deciduous tree with rough serrated leaves" , "One [TYPE OF TREE]" , "Stately tree" , "Perennial plant" , "Timber tree" .)
(Other definitions for birch that I've seen before include "Silver-white barked tree" , "Tree with silvery bark" , "Type of tree" , "Flog" , "Tree, beat" .)
'deciduous tree' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for beech that I've seen before include "Type of tree" , "for mast?" , "It has branches" , "Common forest tree" , "Tree with bitter 'nuts'" .)