Possible Clues:

• Unfortunately, dieter's eaten last of gateau, it's learned
• Cultured type booms out of bedroom suite
• Highly learned
• Learned English, ignorant about Italian
• Learned European, insulting about Italian
• Learned sweetheart's bawdy about sex
• Learned last of gateau consumed by errant dieter
• Like well-read scholars
• Well read
• Learned English: ill-mannered about it