Crossword Genius

Endlessly making claims over woman (7)

Ross

I believe the answer is:

nigella

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'woman' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for nigella that I've seen before include "Woman" , "Flower and TV chef" , "plant" , "girl" , "Love-in-a-mist genus - celebrity cook" .)

I've seen this clue in The Sun.
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