Possible Clues:

• Widen as pupils may
• Expand time for event to accommodate the Italian
• Adulterate
• Being such a swell, I would turn up behind time
• Enlarge fuzzy detail
• Become larger, but attain great age, say
• I'd return after time to explain more fully
• To spread out I would come back close to midnight
• The Italian employed in time to prepare pupils for examination?
• One learner tucked into fruit -- that's what growing pupils do