Crossword Genius

Code about lacking compassion (5)

Ross

I believe the answer is:

morse

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'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" .)

I've seen this clue in The Hindu.
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