Possible Clues:

• Impressionable one in factory
• Be very eager to employ Liberal, one that’s flexible
• Flexible article wedged into short block at base
• Easy to bend
• Spy holds informer at first like putty in his hands
• Flexible — yielding
• Factory in which one must be seen as flexible
• Spy holds informer at first like putty in one's hands
• Adaptable factory once head of industry gets stuck in
• Tractable