Crossword Genius

Two young fellows in New York arranged to board with her (8)

Ross

I believe the answer is:

landlady

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'two' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for landlady that I've seen before include "Provider of digs" , "She takes in lodgers" , "Lodging keeper" , "Woman leasing property" , "Woman who keeps lodgings" .)

I've seen this clue in The Irish Times.
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