Possible Clues:

• Trainee a pair tempt to accept power
• One is bound to be in training
• A written exam oddly has charm for learner
• One learns on the job
• With a tiny amount of money, public relations lure new worker
• A very quiet centre adapted to accommodate one learner
• A payment with small coins put in reserve for trainee
• See 17-Across
• Perhaps Candy Crush payment is delayed by novice
• One bound to learn his craft