Possible Clues:

• Braggart
• Loquacious type
• Blabberer
• Show off deep part of the river
• Exhibitionist's forte, for all to see, in light aircraft
• Can't be quiet with you, Penny and Maurice in Louth
• Braggart's blatant cheek
• Glaring gap exposed by noisy type
• Pistol, for example, making raucous entrance
• Vociferous sort