Crossword Clue:

Proved to be quite a poser?

AnswerCrossword Clue
MODELEDProved to be quite a poser?
TURNEDOUTProved (to be).
ERREDProved to be human
QEDWhich was to be proved
QEDWhich was to be proved: Abbr.
QED"Which was to be proved," for short
PTOLEMYAncient astronomer proved to be wrong by Copernicus