Sits unfortunately by miserable perverts (7)
I believe the answer is:
sadists
'perverts' is the definition.
(sadist is a kind of pervert)
'sits unfortunately by miserable' is the wordplay.
'unfortunately' indicates anagramming the letters.
'by' says to put letters next to each other.
'miserable' becomes 'sad' ('sad' can be similar in meaning to 'miserable').
'sits' is an anagram of 'ists'.
'ists' put after 'sad' is 'SADISTS'.
(Other definitions for sadists that I've seen before include "Brutes" , "deviants" , "They like to hurt" , "Perverted pain-inflicters" , "people with a mean streak" .)