Chap is too adjusted to be so unfeeling (9)

I believe the answer is:

sociopath

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'be so unfeeling' is the definition.
I can't tell whether this defines the answer.

'chap is too adjusted' is the wordplay.
'adjusted' indicates anagramming the letters.
'chap'+'is'+'too'='chapistoo'
'chapistoo' with letters rearranged gives 'SOCIOPATH'.

'to' is the link.

Can you help me to learn more?

(Other definitions for sociopath that I've seen before include "Antisocial being" , "dangerous individual" , "One who's disturbed" , "Psycho" .)

I've seen this clue in The Irish Times.

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