Possible Clues:

• Female isn't well, a female with little energy certain not to conk out
• Guaranteed
• Fine troubles with a heavy metal unlikely to miscarry
• Female has trouble returning a small iron that's not supposed to blow up?
• Is bad article cased in strong iron totally reliable?
• Mark is employed in a bank and is guaranteed to work
• It ensures a return to a safety when something goes wrong with a mechanism
• Exam result for my money is guaranteed to work