Possible Clues:

• American institution that turns 100 tomorrow
• The first one appeared on this date in 1913
• This process would run badly without variables
• Pastime that celebrated its 100th anniversary in 2013
• This indignant line-up, with first of dissenters on floor
• See 17-Across
• This producer's slow, laboriously enlisting a pair of unknowns
• Most of those in 22 across and 8 across presumably, staring you in the face
• You're reading it now
• You're doing this now to take a stand against upsetting column by deputy head at The Maze?