Related Clues:

• Like tweets about Twitter
• Like a definition for “definition”
• Prefix for 'physical'
• Breaking the fourth wall, e.g
• Bone connected to the wrist
• Like a film about a film
• Like crossword clues about crossword clues, say
• Like a list of lists of lists
• "Simple Simon ___ pieman" (2 words)
• Like a photo of a photo
• Like writing about how to write
• Physical opening
• Like writing about writing
• Prefix with stasis or tarsus
• *Iron Maiden, e.g., aptly enough