So or thus (3)
I believe the answer is:
sic
This clue is a double definition.
'so' is the first definition.
('so' in Latin)
'thus' is the second definition.
('thus' in Latin)
(Other definitions for sic that I've seen before include "Urge to attack" , "(Of quoted word) exactly so" , "Intentionally so written" , "Printing term to denote accuracy though it appears otherwise" , "It calls attention to a quoted mistake" .)