Seven stars arranged fair attraction (3,6)

I believe the answer is:

big dipper

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'seven' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for big dipper that I've seen before include "Large bird" , "switchback" , "Roller coaster - The Plough (in the US)" , "Stars in America" , "rollercoaster" .)

I've seen this clue in the Sydney Morning Herald.

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