Possible Clues:

• Musical instrument
• British university left with half of 11's instrument
• Stringed instrument associated with Hawaii
• One's played two blues oddly rejected by British university
• Instrument George Formby used when cleaning windows?
• Marilyn Monroe played one in 'Some Like It Hot'
• Across the sea, university with the foreign engineer is played by the musician
• Instrument played at luaus
• Cult celeb wanting outsiders to support British music-maker
• One that's played with Pelé and Lukaku recalled a King Power outing