Possible Clues:

• One devours slice of beet I'm re-toasting with a roll
• Insect that feeds on wood
• Spy that thing in rotten tree? You might spy this thing in rotten tree
• Wee home wrecker?
• Word that is used to cover tail of malignant ant
• Wood muncher
• Word, Italian, third in thesaurus for 'insect'
• Pest control target
• The hill-dweller makes 22 across with ET up there
• Spell at college with sweetheart destroys Holly, for one