Related Clues:

• National HS exam
• Post-vacation, say
• Utilized a tuffet
• Took a stool sample?
• Couldn't stand any more?
• Stayed out unused
• Calendar ref
• Emulated Humpty Dumpty
• Waited, perhaps
• Lay dormant
• Caught one's breath
• Academic benchmark, briefly
• Precollege exam
• Got into the swing, say
• Occupied a recliner