Palm or plane? (4)
I believe the answer is:
tree
This clue is a double definition.
'palm' is the first definition.
(thesaurus)
'plane?' is the second definition.
(plane tree is a type of tree)
(Other definitions for tree that I've seen before include "Large growth" , "Oak, for example" , "Diagram representing different relationships" , "elder, maybe" , "Genealogist's work" .)