Crossword Genius

Therefore, to the old Romans (4)

Ross

I believe the answer is:

ergo

(Other definitions for ergo that I've seen before include "It follows" , "Consequently" , "'Therefore, to the old Romans (4)'" , "'Cogito, ---- sum'" , "Therefore (Latin)" .)

I've seen this clue in the Irish Times (Simplex) and The Irish Times.
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