Related Clues:

• E-mail address suffix
• Gain
• Catch catcher
• Grid
• After everything
• Line on an invoice, perhaps
• Seine for catching fish
• Safety enhancer
• It may go "swish"
• Monarch catcher
• Surfing site?
• Net material
• Amount left after expenses
• Fisherman's profit?
• Google's realm, with 'the'