WORD PYRAMID V
Credit: GAMES Magazine
July, 1984
Will Shortz

Each of the ten answer words  in the pyramid will contain all the letters of the answer above it - plus one. To solve, add a new letter at each level and anagram the letters to correspond to one of the clues found - in random order - beneath the pyramid.

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

Specialist doctor
______ participle
Most appropriate
Article
Sudden outpouring
Kind of tube
______ once (immediately)
Oolong vessels
Eavesdropping device
Irish produce

Answer:

         A
        AT
       TAP
      PAST
     SPATE
    APTEST
   TEAPOTS
  POTATOES
 OSTEOPATH
TOOTHPASTE