Crossword Genius

Lack of feeling shown by Richardson? (4,11)

Ross

I believe the answer is:

hard heartedness

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'lack of feeling' is the definition.
(hard-hearted means unfeeling or uncaring)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Another definition for hard heartedness that I've seen is " Characteristic of Iago".)

I've seen this clue in The Times.
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