Crossword Genius

Finishes off masterstroke, N English dish and N African one (8)

Ross

I believe the answer is:

couscous

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'one' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

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(Other definitions for couscous that I've seen before include "African dish of crushed and steamed wheat" , "Kind of African semolina" , "Semolina grains" , "African dish of crushed steamed semolina" , "Form of semolina" .)

I've seen this clue in The Times.
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