Possible Clues:

• Endeavour and Frasier, for instance
• Bargains rejected must include cancelled by-products
• Special snooker shots -- attempts to profit from big hits
• Shows created from shows
• By-products or incidental results of larger projects
• Shows derived from shows
• "Frasier" and "Private Practice"
• Shows from shows
• 'Rhoda' and 'Frasier'
• Second-generation shows