The term 'Vegas Fixture' can be summed up by the crossword solution of 'SLOT', which is a four-letter word. A SLOT machine, also known as a fruit machine or poker machine, is a type of casino game that has become a fixture in Las Vegas casinos. SLOT machines are popular because they are easy to play and offer the potential for large payouts. They are also known for their bright lights and loud noises, which add to the atmosphere of the casino.