Crossword Puzzle Added rapidly

Clue: Added rapidly

U.N. rap added rapidly (RANUP with 5 letters)
It may be added to impress? (IVE with 3 letters)
Multiply rapidly (PROLIFERATE with 11 letters)
Prevalent and rapidly spreading (EPIDEMIC with 8 letters)
Added detail (EXPANDED with 8 letters)
Supplements added to each of this puzzle's theme answers (VITAMINS with 8 letters)
Mix rapidly (BEAT with 4 letters)
Leaf through rapidly (RIFFLE with 6 letters)
Failed rapidly (TANKED with 6 letters)
Added candles to the cake, as it were (AGED with 4 letters)