Maple or sycamore, for example (4)
I believe the answer is:
acer
This clue is a double definition.
'maple' is the first definition.
(I've seen this before)
'sycamore for example' is the second definition.
(sycamore is a kind of Acer)
(Other definitions for acer that I've seen before include "Tree or shrub of the maple genus" , "Type of maple" , "Care about the maple?" , "Plant" , "Care about this tree" .)