THEME:   prefix IN- is separated from the root word and read as two words    
GOOD ONES:     How poets write?   IN VERSES [and the other 5 theme entries are as clever]   
Bath bathroom   LOO [Bath is an English city]   
One going downhill fast   SKIER   
Short notes?   IOU'S      
BTW:   Learned   WISE [I know many learned people who are unwise; what I don't know is why this clue has been used, more than once, when there are so very many better clues for 
wise, including "potato chip."]      
Former Cubs slugger   SOSA [I'd have clued it "Former Cubs cheater" or "Cub of ill-repute"]      
Squeaker in Stuttgart   
MAUS [but we're not German and we NEVER use this term]   
RATING:    
 
 
Three grins = Loved it; Two grins = Enjoyed it; One grin = A bit bland for my taste; One teardrop = Not much fun