Crazy bosses dominate (6)
I believe the answer is:
obsess
'dominate' is the definition.
(thesaurus)
'crazy bosses' is the wordplay.
'crazy' is an anagram indicator.
'bosses' anagrammed gives 'OBSESS'.
(Other definitions for obsess that I've seen before include "Constantly worry (about something)" , "Think only" , "Be constantly preoccupied" , "Prey on" , "Persistently preoccupy" .)