You made a point that hurt amidst heartless tirade (6)
I believe the answer is:
touche
'you made a point' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'that hurt amidst heartless tirade' is the wordplay.
'that hurt' becomes 'ouch' (expression of pain).
'amidst' is an insertion indicator (amidst can mean between or within).
'heartless' means to remove the middle letters.
'tirade' with its middle taken out is 'te'.
'ouch' put into 'te' is 'TOUCHE'.
Can you help me to learn more?
(Other definitions for touche that I've seen before include "Fencing call" , "Fencer's shout" , "Acknowledgement of fencing hit or valid criticism" , "You got me" , "Acknowledgment of hit by fencer" .)