Hold back branch (4)
I believe the answer is:
stem
This clue is a double definition.
'hold back' is the first definition.
(I've seen this in another clue)
'branch' is the second definition.
(I have seen 'branch of family' mean 'stem' so perhaps 'branch' could also mean 'stem')
(Other definitions for stem that I've seen before include "Tube" , "Upward part of a plant" , "Restrain - staunch - supporter" , "Slender upright part, of flower or wineglass" , "Ski turn and plant support" .)