Percussion instrument with wooden bars (9)
I believe the answer is:
xylophone
'percussion instrument with wooden bars' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for xylophone that I've seen before include "Percussion instrument played with small mallets" , "Oxyphenol (anag.)" , "Percussion instrument played with mallet" , "Percussion instrument with wooden bars" , "Patrick Moore's instrument" .)