Possible Clues:

• Model test lots only half completed
• Object lesson that was once sufficient
• Second book in short sufficient as specimen
• English vote more than enough, for instance
• Case of past member overwhelmed by drink
• An illustration no longer large enough
• Former partner's more than sufficient for this, say
• Learner goes into gym after test, for instance
• For instance, test papers looked easy initially
• Case that used to be more than big enough?