Stately shade tree (3)
'stately shade tree' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for elm that I've seen before include "Kind of tree" , "Tree of the genus Ulmus" , "Stately tree" , "Source of timber" , "Deciduous tree with rough serrated leaves" .)
(Other definitions for beech that I've seen before include "for mast?" , "Timber tree" , "Tree of Fagus genus" , "Copper or silver tree" , "Nut-bearing tree" .)
(Other definitions for sycamore that I've seen before include "European maple" , "The tree is strangely so creamy" , "Eurasian maple-tree" , "Type of maple tree" , "Ray comes (anag) - tree" .)