Crossword Genius

Careless but lenient confusion with horse (9)

Ross

I believe the answer is:

negligent

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'careless' is the definition.
(similar in meaning)

I cannot understand how the rest of the clue works.

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(Other definitions for negligent that I've seen before include "Not taking due care" , "Careless, remiss" , "Lax" , "Failing to take due care" , "Of the study of insects" .)

I've seen this clue in the Sydney Morning Herald.
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