Related Clues:

• Sprat's preference
• Hardly ever seen
• Mean partner
• Not to be had
• Bibliophile's label
• 7-time Oscar best director nominee
• One-in-a-million
• Far from frequent
• Of interest to collectors, say
• Chophouse request
• Atypical
• Be precarious, maybe
• Quite unusual
• Like some meat
• Like a 1943 copper penny