Related Clues:

• Discontinuity
• Feature of Letterman's smile
• Foramen
• Mall chain, with 'The'
• Sphere, as of interest
• Length x width, for a rectangle
• Mountain pass
• Chamber
• Restricted ___
• The 'A' of 38-Across
• Hiatus
• See 65-Across
• Study, for one
• Sphere of specialty
• Territory