Related Clues:

• Arched recess
• Anagram for "peas"
• Vault may finally collapse
• Part of the church
• Polygonal church projection
• Its glass may be stained
• Area of a church
• It may have stained-glass windows
• It abuts the bema, sometimes
• Semicircular church feature
• Place for relics, perhaps
• Place for an organ, sometimes
• Section under a concha
• Semicircular part of a church
• It's often vaulted