Related Clues:

• 'Elective, not obligatory (8)'
• That's the normal way to give a turn a twist with a pound
• In the ordinary way one might thus give a turn a twist with a pound
• So a turn that's twisted over half a century is quite usual
• The twist of a turn with the half of a century in the nature of things
• Nothing odd so to get a turn to a half-century
• A turn is normal over a half-century
• It's quite usual for it not to be flat
• A turn with a half-century that's neither sharp nor flat
• A turn with a half-century not put on
• Seven, for one
• 7 or 11 on the opening roll at craps is an example of a ___ number
• Not required for one in a 'Platoon' remake
• Birth-related surroundings for you are said to be expected
• Left to choice, not compulsory