Possible Clues:

• Luke with strings attached to the eel
• Student in university, one in Staffordshire, has an instrument
• Instrument commonly injecting energy into even pieces of funk, cello & blues
• George Formby's instrument
• Hawaiian four-stringed guitar
• Something that's plucked: Var.
• This is instrumental in getting student into university, one in Staffordshire
• Luke Lee playing small guitar in the popular style
• Small Hawaiian instrument
• Hawaiian instrument (Var.)