Crossword Genius

Pro ___ (4)

Ross

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3

4

6 3*

(Other definitions for semi that I've seen before include "place" , "One house of pair" , "A whole house (or half?)" , "Articulated lorry (US)" , "eg Half a house" .)

I've seen this clue in The New York Times, the LA Times, the Newsday, the Canadiana and The Wall Street Journal.
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