Crossword Genius

__ pro quo (4)

Ross

I believe the answer is:

(Other definitions for quid that I've seen before include "Nicker (old slang)" , "1 GBP - piece of chewing tobacco" , "One fifth of a fiver" , "Pound (colloq.)" , "Pound (sl.)" .)

I've seen this clue in The New York Times and the USA Today.
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