Code about lacking compassion (5)
I believe the answer is:
morse
'code' is the definition.
(Morse code)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for morse that I've seen before include "Oxford detective" , "TV inspector" , "Dot-dash code inventor" , "Colin Dexter's fictional detective" , "Radio code inventor" .)