Related Clues:

• Flat - consistent - plausible
• Lacking roughness
• Uninterrupted
• Hold water, so to speak
• Hiccup-free
• Stick together for company in this place
• Stick together with male in centre
• Hold together firmly
• To be consistent, he must be in the middle
• Word often used in razor ads
• Un-wrinkled
• Be consistent with echo that's affected leading note
• Keep quiet about controversial plane
• Without lumps
• Point debatable - hard to iron out