Possible Clues:

• Fruit of the rose family
• Fruity liqueur base
• Gin Genre
• 'They's the sole thing black enough when not fasting, by the sound of it (4)'
• Blue-black plumlike fruit
• ___ gin fizz (drink)
• Shrub with a tart fruit
• Fruit in tart jellies
• Fruit similar to a plum
• Plumlike fruit used in gin