Crossword Genius

The second half of the episode has negative effect (4)

Ross

I believe the answer is:

dent

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But I can't explain it at all! Could you help me understand?

(Other definitions for dent that I've seen before include "Hollow from impact" , "Slight hollow" , "Arthur, described by Douglas" , "Slight damage" , "Surface hollow" .)

I've seen this clue in The Hindu.
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