THEME:   NE, symbol for neon, intrudes in normal phrases yielding strange ones   
GOOD ONES:     Moniker on a box of pasta?   PENNE-NAME [pen name]   
Kangaroo from a lab?   CLONED-HOPPER [clod hopper]   
Cops' disagreement?   FINEST-FIGHT [fist fight]   
"No military bigwigs allowed!"?   BRASS-BANNED [brass band]   
Slanted column   OPED [are all opinions by definition slanted? --- mine aren't  

]   
Mind reader?   EEG   
Rock or metal   GENRE [never realized the basic nature of these music terms]   
Level or bevel   TOOL [I thought TRIM, which would fit but was wrong]         
BTW:   Cantina 
condiments   SALSAS [salsa is a sauce and does not connote condiment]      
Cold explosion?   ACHOO [less an explosion than "expression," which would make a better clue]      
Speaking of OUTRE, ARI shipping  is certainly that.      
The title "Neon Lightness" is a stumper for me.  It seems NE is added to phrases so in a sense they, the phrases, would not be "light" or missing something. Perhaps the suggestion is that NE "lights" up the phrases by its intrusion.      
RATING:    
 
 
Three grins = Loved it; Two grins = Enjoyed it; One grin = A bit bland for my taste; One teardrop = Not much fun