Shady trees (4)
I believe the answer is:
elms
'shady 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" , "Mel's strange trees" , "Trees (of late, prone to disease)" , "Trees sound like Cockney steering devices" , "Deciduous trees with rough serrated leaves" .)