The phrase 'It's in the bag' is a popular idiom that means something is certain or secure. The crossword solutions for this phrase are ROSIN (5 letters), TEA (3 letters), MAIL (4 letters), and GOLFCLUB (8 letters). ROSIN is a solid form of resin used to make things sticky, such as violin bows. TEA is a beverage made from the leaves of the TEA plant. MAIL is a system of sending letters, packages, and other items through the post office. A golfclub is a long-handled club used to hit a golf ball. Together, these four words represent the idea that something is certain or secure.