A steady flow from master criminal (6)
I believe the answer is:
stream
'a steady flow' is the definition.
(I've seen this before)
'master criminal' is the wordplay.
'criminal' is an anagram indicator.
'master' with letters rearranged gives 'STREAM'.
'from' is the link.
(Other definitions for stream that I've seen before include "Transmit music or video online" , "Brook, burn" , "Flowing water" , "Master (anag) - current" , "course" .)