Condemn feeling that's heartless (8)
I believe the answer is:
sentence
'condemn' is the definition.
(I know that condemn can be written as sentence)
'feeling that's heartless' is the wordplay.
'feeling' becomes 'sentience' (something sentient is conscious or feeling).
'that's heartless' means to remove the middle letters.
'sentience' with its middle taken out is 'SENTENCE'.
(Other definitions for sentence that I've seen before include "Court's punishment" , "Judicial penalty" , "The fate of criminals" , "unit booked?" , "Judgement passed on criminal" .)