Crossword Genius

Square heart of Ella? (5-5)

Ross

I believe the answer is:

fifty-fifty

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'square' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

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(Other definitions for fifty-fifty that I've seen before include "Fairly" , "Evens" , "Equally" , "Evenly divided" .)

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