Great circle at latitude 0 degrees (7)

I believe the answer is:

equator

(Other definitions for equator that I've seen before include "Imaginary circle round the earth" , "Notional line drawn around the earth" , "Imaginary line round the earth" , "Imaginary line around middle of the earth" , "Line circling the earth" .)

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

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