THEME:   first word of a phrase suggest emptiness   
GOOD ONES:     Insincere talk {& theme}   EMPTY WORDS   
Opening for a chorus line   TRA [as in  tra-la-la]   
Roller with pips   DIE [a unit of dice --- pips are the dots]      
BTW:   Cherub, in Chambrey   
ANGE [but not in the English-speaking world]      
Free from bias   FAIR [It seems to me that bias, a propensity toward or against someone or something, does not preclude fairness.  Prejudice, an unreasoned bias, suggests unfairness by definition.]   
I'll bet the submitted clues for GO UP, LOTUS, SPADE, SPY, PET... were better than the pedestrian ones published.  I reiterate, cleverness and interest are not mutually exclusive from ease.      
RATING:    

Three grins = Loved it; Two grins = Enjoyed it; One grin = A bit bland for my taste; One teardrop = Not much fun