A tree in hand (4)
I believe the answer is:
palm
I believe this is a double definition.
'a tree' is the first definition.
(I know that palm is a type of tree)
'in hand' is the second definition.
('palm' is part of 'hand')
(Other definitions for palm that I've seen before include "Flat part of the hand" , "Use hand" , "Evergreen tree and part of the hand" , "Symbol of victory" , "Queen; station" .)