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