Possible Clues:

• Makin' it sound twice? Capital!
• Sounds like what you're hopin' to be doin' with your capital
• Makin' it a pair, by the sound of it, in Eire
• Where it sounds as if you'd be multiplyin' your capital by two, where they're said to be fair
• 'Ulysses' setting
• Sounds as if here one may be multiplyin' one's capital by two
• Multiplyin' by two, by the sound of it. That's capital! (6)
• City where 'Ulysses' is set
• Ulysses city (Joyce)
• Multiplyin' it by two, by the sound of it - that's capital