Possible Clues:

• See 4-Down
• Red fruit
• That's ruddy rude, by the sound of it
• Blow this, it's ruddy rude
• Reddish fruit
• Blackberry relative
• Vulgar sound like small red fruit
• One way to show disapproval of fruit
• File to cover up orally with a sign of disapproval
• The cane demanded for this rude riposte?