Scoundrels disturbing grouse (6)
I believe the answer is:
rogues
'scoundrels' is the definition.
(I know this)
'disturbing grouse' is the wordplay.
'disturbing' is an anagram indicator (I've seen this in other clues).
'grouse' is an anagram of 'ROGUES'.
(Other definitions for rogues that I've seen before include "Varlets" , "'Scoundrels, charlatans (6)'" , "'Dishonest, unscrupulous persons (6)'" , "Scoundrels, miscreants" , "Rascals" .)