Disturb the master flow (6)
I believe the answer is:
stream
'flow' is the definition.
(synonyms)
'disturb the master' is the wordplay.
'disturb' indicates an anagram (I've seen 'disturbed' mean this).
'master' is an anagram of 'STREAM'.
(Other definitions for stream that I've seen before include "play in real time" , "Master (anag) - current" , "One small river" , "Current - file" , "Torrent" .)