Possible Clues:

• It's not the nipper's own hair that's too long at the sides
• Aural toupee for insect
• False hair under the lug of a little nipper
• How I grew a little nipper
• An insect, I wager (anag.)
• Insect - eavesdrop
• The hair over the ears in the sect
• Small insect ... or eavesdrop, to a Brit
• Off and on he has Rowling bug
• Insect — eavesdrop