Possible Clues:

• 59-Across student
• Services trainee
• Forces newbie into ill-fated action the wrong way
• Trainee state police officer cut short
• Force trainee to execute 'duck and cover', primarily when retreating
• Military pupil
• Space ___ (flaky person)
• Learner, more or less idlest, periodically
• Academy trainee
• Trainee in rebel element, ultimately