Hate to pass on tackling review of heartless murders (7)
I believe the answer is:
dislike
'hate' is the definition.
(I know that hate is a more specific form of the action dislike)
'pass on tackling review of heartless murders' is the wordplay.
'pass on' becomes 'die' (pass on can mean to die).
'tackling' means one lot of letters goes inside another (to tackle is to take possession of).
'review' says the letters should be written backwards.
'of heartless' means to remove the middle letters (I've seen 'heartless' mean this).
'murders' becomes 'kills' (I've seen this before).
'kills' with its centre taken out is 'kils'.
'kils' in reverse letter order is 'slik'.
'die' enclosing 'slik' is 'DISLIKE'.
'to' is the link.
(Other definitions for dislike that I've seen before include "Object to" , "Hostility" , "Don't take to" , "Hate" , "Loathe" .)