Possible Clues:

• Pounds being invested, that is by no means the best for industry
• Learner that is lying around least likely to study?
• Like the most reluctant pupil that is having to get a grasp of Latin
• Being least active, I had to take the continental way
• Large filling that is most unlikely to work?
• Superlative for Wally in 'Dilbert'
• Most futile, having papers in case
• The least occupied listed building
• Most inactive or indolent