Dumpty

5 clues
Humpty-___
... __ sat ...
Half of a nursery rhyme name
Notable nursery rhyme surname
Last name for an unbalanced egghead?
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Actdumb
Acteddumb
Actingdumb
Adabsurdum
Addendum
Adumb
Adumbrate
Adumbration
Adump
Agendum
Albusdumbledore
Alexandredumas
Ammodump
Asdumb
Badump
Bigdummy
Braindumps
Carborundum
Chessfordummies
Citydumpling