Possible Clues:

• Round number that is least productive
• Liberal that is outwardly least fond of Labour?
• 'Or ___ froth amid the boundless main': Emily Brontë
• Most frivolous setter would allow second entry
• The laziest I'd put first - in case ...
• Least diligent learner that is put outside
• Most indolent or inactive
• Least busy and laziest
• Least productive learner that is put outside
• Accepting lecturer that is not doing anything