Possible Clues:

• Instrument to chop — sharpen axes first
• Marimba's kin
• Bax's last hope — only in pieces requiring this?
• Instrument with wooden bars to be struck
• Oxyphenol derivative that is used by wood tappers
• Axes cut and perfect this instrument
• Cross yard to cut and polish 7's implement
• Oxyphenol (anag.)
• Hammer this, or use axes to chop and polish
• Axes cut more than 50 per cent of upright instrument