Means he gets to the heart of, at last (2,3,3)
I believe the answer is:
in the end
'at last' is the definition.
(synonyms)
'means he gets to the heart' is the wordplay.
I cannot really see how this works, but
'he' is within the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found within the answer.
This explanation may well be incorrect...
'of' acts as a link.
Can you help me to learn more?
(Other definitions for in the end that I've seen before include "Finally" , "Eventually" , "Ultimately" , "At long last" , "Then Enid came at last" .)