Crossword Genius

... heartlessviolent reaction (8)

Ross

I believe the answer is:

backlash

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'reaction' is the definition.
(I know that backlash is a type of reaction)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for backlash that I've seen before include "Strong negative reaction to a development" , "Violent reaction to event, like reverse whip" , "Repercussion" , "Provoked adverse reaction" , "negative comments?" .)

I've seen this clue in The Telegraph.
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