Lecturer of French, stern, coming round (6)
I believe the answer is:
reader
'lecturer' is the definition.
('reader' can be a synonym of 'lecturer')
'of french stern coming round' is the wordplay.
'of french' becomes 'de'.
'stern' becomes 'rear' ('rear' can be a synonym of 'stern').
'coming round' is an insertion indicator.
'de' placed inside 'rear' is 'READER'.
(Other definitions for reader that I've seen before include "Person addressed by author" , "Kind of textbook - or its peruser" , "Interpreter of what is written" , "Publisher's selector" , "Peruser of texts" .)