Related Clues:

• Permissive one in platoon out of order
• Not required -- too plain, to put it horribly
• Chair one found in class
• It supports the chairman
• Voluntary one found in irregular platoon
• Unforced
• Group bordering a parliamentary constituency
• I plan too haphazardly but it's a matter of choice
• Country house in MP's constituency
• Work time on island left down to choice
• Anagram of "sate"
• Be a good usher
• Senate slot
• At sea, a pilot? No, not required
• Boarding pass information