THEME:   RAH hidden in phrases   
GOOD ONES:     Stadium supporters {& their cry}   CHEERING SECTION [almost missed the three letters common to the three phrases]   
London home of Constables and Sargents   TATE [note caps and spelling]   
Metalworking union   WELD   
State secrets?   SNITCH      
BTW:   Seeking lodging   LOOKING FOR A HOME [really?  When was the last time 
lodging was used to mean anything other than hotel accommodations?]      
Global financial org.   IMF [it's always going to be the Impossible Mission File to me, just as "William Tell Overture" is the Lone Ranger: child of the Fifties]       
Purring snuggler  
 LAPCAT [maybe it's a word in the feline world, but I'm not buying it]      
ATOI and ETRE are not used in English --- only Xwords.         
RATING: 
 
  
   Three grins = Loved it; Two grins = Enjoyed it; One grin = A bit bland for my taste; One teardrop = Not much fun