Clue: Solo's key line is one of two that were abandoned (6)
Answer: HANSEL
Explanation: Solo's key line is one of two that were abandoned (6)

**HAN'S** ("Solo's") + **E** ("key", a musical note) + **L **(line)
 

 
*Hans Solo is Harrison Ford's character in the *Star Wars* movie franchise, and Hansel was one of the children abandoned by their father in the Grimms' fairy tale *Hansel and Gretel.