maple or birch (4)
I believe the answer is:
tree
I believe this clue is a double definition.
'maple' is the first definition.
(maple is a type of tree)
'birch' is the second definition.
(I've seen this before)
(Other definitions for tree that I've seen before include "Diagram representing different relationships" , "Eg, a baobab" , "Birch, say" , "Sequoia, for example" , "Genealogy chart" .)