The term 'Girl from Uncle' refers to a popular 1960s television show starring Robert Vaughn and David McCallum. The show follows the adventures of secret agent Napoleon Solo and his partner Illya Kuryakin as they battle the forces of evil. In the show, Napoleon has a niece, April Dancer, who is often referred to as the 'Girl from Uncle'. In terms of crossword solutions, the term 'Girl from Uncle' can be broken down into three words: COUSIN (6 letters), Niece (5 letters), and Stepniece (9 letters). A COUSIN is a relative who is the child of one's aunt or uncle, while a niece is the daughter of one's sibling. A stepniece is the daughter of one's step-sibling. Therefore, the term 'Girl from Uncle' can be used to describe a female relative who is either a COUSIN, niece, or stepniece.