Undesirable folk shooting grouse (6)
I believe the answer is:
rogues
'undesirable folk shooting' is the definition.
Although both the answer and 'shooting' are nouns, they are not in the same form of the noun.
'grouse' is the wordplay.
'grouse' can be anagrammed to 'ROGUES'.
However, I am not sure how this is indicated.
Can you help me to learn more?
(Other definitions for rogues that I've seen before include "Wild animals driven away from the herd" , "Varlets" , "Rascals" , "'Dishonest, unscrupulous persons (6)'" , "'Scoundrels, charlatans (6)'" .)