THEME:   CRAZY, HORSE, SITTING, BULL respectively begin phrases   
GOOD ONES:     Nationality of {theme}   SIOUX   
Hems but doesn't haw   SEWS   
Zippo   NADA   
Half dos   UNO [if it were hair, as I first thought, the clue would be "Half-do's"]      
BTW:   Correct copy   EDIT [I'd add "at times" since I've had editors make my copy incorrect]      
They have strings attached   YO-YOS [as I said last week, the clue would better be "There areā¦"]      
Heart's "Crazy on You" is one great rock song --- and "A bit blue" [RACY at 63-Across].  Thanks for the memory, J.G.       
RATING: 
 
  
   Three grins = Loved it; Two grins = Enjoyed it; One grin = A bit bland for my taste; One teardrop = Not much fun