THEME:   five phrases meaning "duplicate" [interesting that the phrases are of appropriate length]   
GOOD ONES:     Rest of the afternoon   NAP   
Forward-looking claim   ESP   
Hardy lass   TESS [oldie but goodie --- so is Tess]         
BTW:   Tijuana tots   NENES [Why would English speakers know this term, and why not clue it "Hawaiian birds"?]      
I don't believe I ever saw or heard "would 
I LET you down," but in any event it is not a familiar expression.  Would "go to the" be an acceptable answer to the clue "let's ___ store"?       
Driller's letters   DMD [What is this?  I had ADA and was forced to write-over my neatly printed black ink lettering!]  
      RATING:    
 
Three grins = Loved it; Two grins = Enjoyed it; One grin = A bit bland for my taste; One teardrop = Not much fun