user: Question: What was the aggregate for the celebrity who was known for being a Singer and had 7 dances?
Columns: ['Celebrity', 'Known for', 'Age', 'Professional', 'Series', 'Place', 'Dances', 'Highest score', 'Lowest score', 'Aggregate', 'Average']
Types: ['text', 'text', 'real', 'text', 'real', 'text', 'real', 'real', 'real', 'real', 'text']
Sample row: ['Jason Wood', 'Comedian', 32.0, 'Kylie Jones', 1.0, '8th/8', 2.0, 21.0, 19.0, 40.0, '20.0']
SQL:

assistant: SELECT "Aggregate" FROM "Table" WHERE "Dances" = 7.0 AND "Known for" = 'Singer';