Related Clues:

• Frightful bores, sedate and rational
• Far from hammered
• Switch edges on dresses? That's rational
• In similes, like a judge rather than a lord
• Like one who passes the bar, perhaps?
• Fit for designated driving
• Not even a bit tiddly
• Not affected by a chemical substance
• Serious Scots greeting one half-heartedly
• Without excess: in this way, live right
• Dry; staid
• Staid, solemn
• Like an unimpaired driver