Check Sartre translation (6)
I believe the answer is:
arrest
'check' is the definition.
('arrest' can be a synonym of 'check')
'sartre translation' is the wordplay.
'translation' indicates an anagram.
'sartre' with letters rearranged gives 'ARREST'.
(Other definitions for arrest that I've seen before include "apprehend a law-breaker" , "Land next to the sea" , "Nab" , "Stop (on suspicion)" , "Collar" .)