THEME:   phrases beginning with a synonym of HINT   
GOOD ONES:     Gets the unspoken message {& theme}   TAKES A HINT [two meanings of HINT: a little bit; clue]   
Recitals showing promise   OATHS [they are recited or spoken]   
Stable rides for kids   TRIKES [not ponies]   
Keep up on the issues?   RENEW   
Worker who gives people fits?   TAILOR      
BTW:   Word with modern or cave   ART [about the same to me: modern art = atavistic]      
If all goes according to plan   AT BEST [yes, but I sense "tin earism" here]      
Hopping mad   HET UP [maybe, but I sense more tin]      
Frozen 
Wasser   EIS [don't know why there is a capital W, but whatever the case, German EIS is not used in our tongue]      
Good to see ACER is finally clued correctly.         
RATING:    
 
 
Three grins = Loved it; Two grins = Enjoyed it; One grin = A bit bland for my taste; One teardrop = Not much fun