Crossword Genius

Terminal heartbreak (5)

Ross

I believe the answer is:

earth

I'm a little stuck... Click here to teach me more about this clue!

This could be a double definition.

'terminal' is the first definition.
(I've seen this before)

'heartbreak' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

Can you help me to learn more?

(Other definitions for earth that I've seen before include "wire" , "our home" , "Solid ground" , "Heart (anag)" , "costs so much?" .)

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