THEME: phrases with PE removed still make sense
GOOD ONES: Slangy denial {& theme}
NOPE [that is, "no PE"]
Franken and Yankocic, for example? (PE)
ALS OF LAUGHTER Silver-tongued speaker?
SMOOTH O(PE)
RATOR "Sorry, the mayo has been put on in advance"
IT CAN'T BE HEL(PE)
D Union in D.C., e.g. STA (Union Station on the Metro)
Abe or Dick PREZ [Honest Abe and "The Crook" --- but I had PRES]
Some kids GOATS
Buck tail? AROO [not the deer]
BTW: A dispersive one is commonly triangular PRISM [better would be "pyramidal" since it's 3D]
Where Yankee Doodle's feather ended up IN HIS HAT [I thought it was "cap"]
NLER is never used in print or speech --- only in Xwords
RATING:

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