Related Clues:

• Twin it with a right eejit
• Informally, a foolish person, featherbrain
• Informally a stupid person, like funny flea?
• Foolish person like funny louse?
• Old fogey
• Extinct bird of Mauritius, very dead
• Louse egg with humour - silly fellow
• Foolish person like humorous louse
• 'Foolish, silly person (6)'
• If you perform it twice the same way you'll get the bird
• Only a fool would make a twin with it
• That fool of a twin gets with it
• All told, there's little sense in one
• Sounds as if one needs something additional on to be all there
• If you're not all there, you need something added on, by the sound of it