Possible Clues:

• Gateway for Rick and Morty, often
• Dockland area with a large entrance
• On the move, patrol entrance
• Wormhole in sci-fi, e.g
• Special website bringing together information from diverse sources in a uniform way
• Innovative video game launched in 2007, in which the player-character is promised cake for solving puzzles
• Opening wine going with nearly everything
• Website's access page
• Left a student to find entrance
• Ladies at Glastonbury, say, give up rings at gate