Related Clues:

• Having no flex
• Firm's free to employ serviceman
• Unmovable
• Like a hard-liner
• Gear I'd found inflexible
• Firm, inflexible
• Not chill at all
• It's typical of The Board to manipulate the papers
• Siegfried drops fees for firm
• Unable to be forced out of shape
• Hard to fake passport, perhaps?
• Stiff and unmoving
• Like a dirigible, vis-a-vis a blimp
• Harsh soldier's shut outside
• Like drumstick