Inherently nervous flatfish (5)

I believe the answer is:

witch

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

(Other definitions for witch that I've seen before include "Sorceress" , "Enchantress" , "Wise, wicked, woman" , "Female member of coven" , "... and magician" .)

I've seen this clue in The Hindu.

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