Possible Clues:

• Illegible lettering: that is, crude line
• Symphony's opening with slow movement that's carelessly written
• Quickly pen first of sheep with powerful stroke
• Write messily
• Informal writing, namely a sort of plug
• Bad handwriting
• Make slow progress on son's writing
• 'Second stroke' in doctor's writing?
• Write badly with small stroke
• It's hard to read Edison leaving out of cowardliness