Having a hard time with vertical spacing?

[Molly Preston]

I'm unclear as to how to make more room between staves when it's in one instrument in a part.

I tried 

\layout {

\context 

{ \Staff

    \override VerticalAxisGroup.default-staff-staff-spacing.basic-distance = #10

} 

}

However, I think this is just between two separate staves that aren't grouped. Is there a way to separate between staves in a part?

-Molly