Possible Clues:

• What a substitute will usually do
• It's up in short to get down
• What a pro might do with the toast if he could not stand it
• Use the waiting room
• Pose for a picture
• That is the wrong way, notwithstanding (3)
• Mind the tykes
• Convene, in a way
• Get comfortable in the bleachers
• Vacillate (beginning)