Possible Clues:

• Where an extra case may be added, on top of everything else
• Shocker penned by child as well
• Into the bargain
• Additionally unpleasant smell's penetrating honk
• Black ducks are in shot as well
• Additionally, where one may apply a shoehorn
• On top of all that
• Shocker in short, also
• It's as well to give this a kick