Yew or willow (4)
I believe the answer is:
tree
This clue is a double definition.
'yew' is the first definition.
(yew is a type of tree)
'willow' is the second definition.
(thesaurus)
(Other definitions for tree that I've seen before include "Sequoia, for example" , "May" , "cross" , "Eg, elm or oak" , "Shoe stretcher" .)