Possible Clues:

• Small insect with aural toupee?
• An insect; to eavesdrop (slang)
• Pincered bug
• Eavesdrop, for example, about war, I fancy
• Bug, we hear!
• Has the little nipper got a hairy lug?
• I wager (anag.)
• One little creature or two that may be found on head
• That little nipper is so sound and hairy
• Listen with attention - wine is good for starters