Actor Herbert leaves home? (4)
I believe the answer is:
tree
'leaves home?' is the definition.
(I've seen this in another clue)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for tree that I've seen before include "Root-and-branch plant?" , "Eg, alder" , "Holly, perhaps" , "Conifer, for example" , "Diagram representing different relationships" .)