Thus quoted, in turn, with some precision (3)
I believe the answer is:
sic
'thus' is the definition.
('thus' in Latin)
'turn with some precision' is the wordplay.
'turn' says the letters should be written backwards.
'with' indicates a hidden word.
'cis' is hidden within 'some precision'.
'cis' backwards is 'SIC'.
'quoted in' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for sic that I've seen before include "poorly spelt if requiring this" , "Word to call attention to a quoted mistake" , "Urge to attack" , "As it stands, in printing" , "(Of quoted word) exactly so" .)