WORD PYRAMID III
Credit: GAMES Magazine
June, 1983
Merl Reagle

Each answer word in the pyramid will contain all the letters of the previous answer plus one. To solve, add a new letter at each level and anagram the letters to correspond to one of the clues found beneath the pyramid.

                _
              _ _
            _ _ _
           _ _ _ _
         _ _ _ _ _
        _ _ _ _ _ _
      _ _ _ _ _ _ _
    _ _ _ _ _ _ _ _
   _ _ _ _ _ _ _ _ _
  _ _ _ _ _ _ _ _ _ _
 _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _

"The _____ is cast"
Added in the middle
Slyly malicious
Disclaims, as responsibility
Obama, for example
Personal pronoun
Predetermine, as by fate
Walker
Reckless urgency
_____ of March
Pretended to be someone else
Superego's counterpart

Answers:

              I 
             ID
           DIE
          IDES
        SNIDE
       DENIES
      DESTINE
     INSERTED
    PRESIDENT
  PEDESTRIAN
 DESPERATION
IMPERSONATED