Possible Clues:

• Process of becoming out of date or no longer needed
• Redundancy offensive involves only Conservative leader separately
• Close obscene broadcasting, offering redundancy
• Process of becoming out of date
• The state of falling into disuse
• Out-of-date quality
• Old boy, only one dropping out of physics perhaps, getting past it
• Alumnus with single sphere of knowledge, not one that's going out of date