Where sacrifices may be made involving one star (6)

I believe the answer is:

altair

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'one star' is the definition.
(Altair is a star in the constellation of Aquila)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for altair that I've seen before include "Bright star in Aquila" , "Heavenly body" , "Lariat (anag) - star in Aquila" , "Bright star; lariat (anag.)" , "Member of Eagle family" .)

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