Possible Clues:

• Conservative faction
• Member of Royal Irish Constabulary in a faction that isn't open to new ideas
• They're hardly revolutionary
• Most conservative members of a group - of sentries
• Long-standing members resistant to change
• Original or most conservative members of a group, like ancient sentry
• Conservative members
• Those relieved when change occurs? Yes and no
• Those resistant to change
• Long-standing group members, set in their ways