The result of a cardiac transplant? (13)

I believe the answer is:

changeofheart

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'transplant?' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'the result of a cardiac' is the wordplay.
'the result' becomes 'change' (change is a kind of result).
'a cardiac' becomes 'heart' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'change'+'of'+'heart'='CHANGEOFHEART'

Can you help me to learn more?

(Another definition for changeofheart that I've seen is " Conversion (to kinder action?)".)

I've seen this clue in The Irish News.

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