Master flying jet (6)
I believe the answer is:
stream
'jet' is the definition.
(thesaurus)
'master flying' is the wordplay.
'flying' indicates anagramming the letters.
'master' anagrammed gives 'STREAM'.
(Other definitions for stream that I've seen before include "Small narrow flow" , "'Current, flow (6)'" , "Brook or rivulet" , "play in real time" , "divide pupils into ability groups" .)