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The hotline? (7)

Ross

I believe the answer is:

equator

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If this is the answer I cannot explain how the clue works.

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(Other definitions for equator that I've seen before include "Circle separating northern and southern hemispheres" , "Circle round the globe" , "It's at zero degrees latitude" , "north-south divide?" , "Hemisphere divider" .)

I've seen this clue in The Irish Independent.
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