Related Clues:

• Like a mattress with little give
• Concern with conviction
• Fixed; company
• Settled having something to watch on TV after changing sides
• Forceful flick, using the other hand
• Adamant business is steady
• Hard; company
• Secure — business
• Constant company
• Tree, mark, is solidly rooted
• Solid, stable
• Tree on top of mountain is unshakeable
• Company, business
• Mattress specification
• Tofu descriptor