Shady tree (3)
'shady 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 "Perennial plant" , "Furniture wood" , "Native British tree" , "wood used in pelmets" , "I branch out" .)
(Other definitions for cedar that I've seen before include "Raced around a mighty tree" , "Tree (Lebanese?)" , "Fragrant conifer" , "representative of Lebanon?" , "Tall conifer" .)