Tall shade trees (4)
I believe the answer is:
elms
'tall shade trees' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for elms that I've seen before include "rugged feature of country churchyard" , "Trees (of late, prone to disease)" , "Trees sound like Cockney steering devices" , "may have many leaves" , "Deciduous trees with rough serrated leaves" .)