Related Clues:

• Deep sound from Hereford?
• One fly straddles black line on weather map
• Humble exhortation to watch weight
• One's no obstacle in the meteorologist's line
• Is old pub a feature on some maps?
• Almost on "E"
• Line showing points having equal barometric pressure at a given time
• One prisoner at the centre serves drink - it presumably creates its own pressure
• Word with "beam" or "blow"
• 'Down in ___!'
• "Down in ___!"
• Air-conditioner setting
• Coldest temperature
• Mean something from Guernsey?
• Subdued sound of cattle