Related Clues:

• Bitter substance girl preserved apparently
• Uni grad
• One who's done with U?
• Red wine astringent
• Chemical compound in e.g. tea
• Nostalgic sch. visitor, perhaps
• Bitter compound in tea
• Many a school donor
• HS reunion attendee
• Typical college donor, briefly
• '2016 class member, now
• Past frat bro, say