Stop translating Sartre (6)
I believe the answer is:
arrest
'stop' is the definition.
(I know that arrest is a kind of stop)
'translating sartre' is the wordplay.
'translating' is an anagram indicator.
'sartre' is an anagram of 'ARREST'.
(Other definitions for arrest that I've seen before include "Bring to a standstill" , "Cause to stop" , "Nab" , "Stop - take into custody" , "Seize (a crime suspect)" .)