So ill, reportedly (3)
I believe the answer is:
sic
'so' is the definition.
('so' in Latin)
'ill reportedly' is the wordplay.
'ill' becomes 'sick' (similar in meaning).
'reportedly' indicates a 'sounds like' (homophone) clue.
'sick' is a homophone of 'SIC'.
(Other definitions for sic that I've seen before include "Thus among musicians" , "Thus - in Latin" , "Intentionally so written" , "It calls attention to a quoted mistake" , "Urge to attack" .)