Broom of twigs (5)
I believe the answer is:
besom
'broom of twigs' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for besom that I've seen before include "Twig broom" , "Concoction of twigs" , "Twig-broom" , "Broom made from twigs tied to a handle" , "cleaner?" .)