Crossword Genius

NS, DP etc baffled stepsister (7)

Ross

I believe the answer is:

setters

I'm a little stuck... Click here to teach me more about this clue!

'ns' is the definition.
Although both the answer and definition are plural nouns, I don't understand how one could define the other.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for setters that I've seen before include "Long-haired gun dogs" , "eg Scottish, Gordon and 18" , "Canine" , "Crossword compilers" , "people like me" .)

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