Has broken wood (3)
I believe the answer is:
ash
'wood' is the definition.
(I've seen this before)
'has broken' is the wordplay.
'broken' is an anagram indicator.
'has' is an anagram of 'ASH'.
(Other definitions for ash that I've seen before include "Tree; cinders" , "Powdery residue from fire or cigarette" , "Get the residue" , "Residue after burning" , "Fire's remains" .)