Related Clues:

• Nod's verbal equivalent
• ''That's great!''
• "Roger that"
• In the 50s or 60s, say
• 'Very nice!'
• On an even keel
• ''Yep!''
• "I'm still listening" comment
• 'I reckon so'
• Warmer than chilly
• Calm under pressure
• '10-4'
• Hard to rattle
• 'For sure'
• Even-tempered