THEME:   six longest words spelled only with the letters of musical notes   
GOOD ONES:     They're graphically represented {& theme}   NOTES [the grid employs blocks shaped as notes]   
Took the wrong way?   STOLE [oldie but goodie]   
Head of the produce section?   CABBAGE   
Newspaper fig.   CIRC [not a person but a number]      
BTW:   High-five relative   DAP [if legitimate dictionaries do not define the limits of Xwords, is there any point in not allowing JWQXZ as an entry? And what's wrong with DAP as a product for filling holes and cracks?]      
Romantic activity   BUSSING [yes, very Colonial; I'd go with "Supreme Court stupidity"]      
Old-style warning   ALARUM [most appropriate given 5-Across' POE wrote "Bells" wherein ALARUM bells scream]      
Rather little   A LACK OF [It can work, but I think 
rather little of this clue for it's 
lack of precision.  Lack=none; little=some.]         
RATING:    
 
 
Three grins = Loved it; Two grins = Enjoyed it; One grin = A bit bland for my taste; One teardrop = Not much fun