Related Clues:

• Express train finally entering test
• Air conduit
• Show emotion, in a way
• Go on a tweetstorm, say
• '___ 'Havoc,' and let slip the dogs of war': Mark Antony
• Hole allowing gas or air to escape
• The ___ was a recent BBC One drama about a custody battle
• Puff perhaps, now apparently unhealthy?
• 'Yay!' or 'Hey!'
• React to sliced onions
• Expire, no longer in good health
• Show lamentation
• Give free expression to — opening
• Don't hold your breath, as former partner is on heroin and taking drink
• Advice for relaxing