Possible Clues:

• Fruit in the lyrics to "Portland, Oregon"
• Plum-like fruit
• One of the Bushes doesn't sound very smart
• Could one get into gin? Only with a change of heart
• Fruit steeped in gin to make a liqueur
• Relative of a cherry plum
• English jelly fruit
• Sharp-tasting fruit
• Blue-black fruit of the blackthorn
• Wild plum with a sour flavor