Our home has a fireside location not hot to begin with (5)

I believe the answer is:

earth

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'our home' is the definition.
(home of all humanity)

I don't understand how the remainder of the clue works.

(Other definitions for earth that I've seen before include "Heart of clay" , "Make electrics safe" , "Huge cost" , "Our favourite planet" , "Third planet from the Sun" .)

I've seen this clue in The Telegraph.

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