Crossword Genius

What could make killer become kinder? (6,2,5)

Ross

I believe the answer is:

change of heart

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If this is the answer, I'm afraid I cannot explain it.

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(Other definitions for change of heart that I've seen before include "second 5 [THOUGHTS]" , "Having a different view" , "Conversion (to kinder action?)" , "Profound shift in outlook" , "Profound alteration in outlook or opinion" .)

I've seen this clue in The Sunday Times and The Times.
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