Master translated for class (6)
I believe the answer is:
stream
'for class' is the definition.
(stream can mean a class of similarly able pupils)
'master translated' is the wordplay.
'translated' is an anagram indicator.
'master' with letters rearranged gives 'STREAM'.
(Other definitions for stream that I've seen before include "Brook or small river" , "Current - file" , "Moving water" , "'Current, flow (6)'" , "River - current" .)