Painful, but excellent without exercise (4). I think it is ACHE (painful) but cannot see the connection with exercise
7a, Saw back behind but not at first (5): ?O?T?
22a, Frostiness close to insult in city's refinement (6): N?C?T? - Looks like NICETY, but why?...
Literary school for Franciscans (10) ?????R?A?SS