Possible Clues:

• The little nipper grew to be A.1
• To eavesdrop I wager is wrong
• Listen - and start to expect a right shock
• A bug for Americans to eavesdrop
• Insect found somewhere near Wigtown
• The little nipper had 4 down under the start of 18 across
• The hair that goes on ahead may make one feel the pinch
• Will the little nipper get sound but be false on ahead?
• Small creature with a pair of head attachments
• A little nipper