THEME:   phrases contain prefixes of SPHERE   
GOOD ONES:     Word that can follow {theme}   SPHERE   
Elementary fellow?   SHERLOCK [I'd exchange 
fellow for "chap."]   
Land at Orly?   TERRE      
BTW:   Lunchbox item   
SOUPTHERMOS [what's a soup thermos --- anything like a coffee, tea, or water thermos?]      
Empty threat   PAPER TIGER [it's the person not the threat, so the clue should indicate person: "All bark-no bite 
guy" or maybe just "Obama" --- sorry for politics]    
   Floride & ETAT are not words in English, and 
NLER is not a word in any language.      
CPA's office, perhaps   STE [likely an abbr. of SUITE, but if so, most CPA's don't have suites;  I'd go with "Magnate's office"]      
I liked this puzzle for its scientific bent:  
exo-, thermo-, meso-, troposhpere as well as 
BOSONS.      
RATING:    
 
Three grins = Loved it; Two grins = Enjoyed it; One grin = A bit bland for my taste; One teardrop = Not much fun