Crossword Puzzle Does some above average schoolwork

Clue: Does some above average schoolwork

Grade option that doesn't affect one's grade point average (PASSFAIL with 8 letters)
Amount that doesn't show favoritism (EQUALSHARE with 10 letters)
Be aboveboard? (GETOUTFROMUNDER with 15 letters)
Somersault (e.g. FLIP with 4 letters)
Workplace that doesn't require union membership (OPENSHOP with 8 letters)
Doesn't match (CLASHES with 7 letters)
The Autobahn doesn't have one (SLOWLANE with 8 letters)
She has one, but he doesn't (ESS with 3 letters)
It has wings but doesn't fly (THEATRE with 7 letters)
Doesn't break down (LASTS with 5 letters)