Crossword Genius

Middle Earth is back to front (5)

Ross

I believe the answer is:

heart

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

'middle' is the definition.
(synonyms)

'earth is back to front' is the wordplay.
'earth' can be anagrammed to 'HEART'.
But, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for heart that I've seen before include "It's in the chest" , "Nucleus" , "the name of a prison in Midlothian!" , "Vital part" , "Middle" .)

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