Gush when master dances (6)
I believe the answer is:
stream
'gush' is the definition.
(thesaurus)
'master dances' is the wordplay.
'dances' indicates anagramming the letters.
'master' is an anagram of 'STREAM'.
'when' acts as a link.
(Other definitions for stream that I've seen before include "Brook, burn" , "'Brook, runnel (6)'" , "Running liquid" , "Transmit music or video online" , "Flow of water on land" .)