Current form for master? (6)
I believe the answer is:
stream
'current' is the definition.
(synonyms)
'form for master?' is the wordplay.
'form for' is an anagram indicator (another form of the letters).
'master' is an anagram of 'STREAM'.
(Other definitions for stream that I've seen before include "River - current" , "Quantity of water" , "pupils pour out" , "Moving water" , "One small river" .)