The clues below can be answered with words according to a certain pattern. Can you determine what it is?

1. PRETENTIOUS + 1
2. DRUNK + 1
3. EXIST + 1
4. WAS CONCERNED + 1
5. HANDBILL + 2
6. MORE CUNNING + 2

HINTS:
#1: Another word for pretentious is ARTY
#2: +1 and +2 stand for added letters.
#3: The added letters are all the same.
#4: The answer to #1 is PARTY.

Answers:

1. PARTY  (ARTY + P)
2. PLUSH  (LUSH + P)
3. PARE     (ARE + P)
4. CARPED  (CARED + P)
5. FLIPPER  (FLIER + PP)
6. SLIPPER  (SLIER + PP)

Credit:
Matt Ginsberg
EASY, PEASY