### Clue: Mama from 1960s at home with Italian astronomer (7)
### Answer: CASSINI 
 ### Explanation: Definition: astronomer
(Mama) **CASS** + **IN** ("at home") *with* **I** (Italian) 
*Cass Elliot (aka Mama Cass) was a member of the 1960s band, the Mamas and the Papas