THEME:   BRIDGE gives meaning to the words on either side of a block   
GOOD ONES:     Apt word to substitute…{theme}   BRIDGE   
Creepy thing   MOSS   
New Deal initials   FDR [not WPA, NRA, or TVA as I first thought missing the obvious]   
Squealer with a tail or tale   RAT     
TV cousin   ITT [naturally I thought something electronic, not a character from "The Munsters"]      
BTW:   Valedictorian's nightmare   EFF [Wrong!  
B is the nightmare; 
F is not even dreamed of]      
Tip   DOFF [DOFF means to remove; Tip means to adjust one's hat instead of removing it to show respect]      
NOODGES is another of many words of Yiddish origin used in speech mainly by Jewish New Yorkers or those who grew up there.  
Nosh is another.        
RATING:    
 
Three grins = Loved it; Two grins = Enjoyed it; One grin = A bit bland for my taste; One teardrop = Not much fun