Crossword Genius

Secure against shock though heartbroken (5)

Ross

I believe the answer is:

earth

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'heartbroken' is the definition.
(heart anagrammed 'broken' can make earth)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for earth that I've seen before include "our present abode" , "Where some creatures live" , "Soil; ground terminal" , "See 12" , "Huge cost" .)

I've seen this clue in The Globe and Mail.
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