Related Clues:

• That's enough to make a serpent seriously annoyed, to a pronounced extent
• H like a peril of the sea
• Like a robber all at sea with an H, by the sound of it
• By way of a criminal to a pronounced extent
• One of 17 across gets one angry to a criminal extent
• Might make the snake cross with the sound of the H
• H may sound like a robber
• Like a criminal, see the sound of it
• Speak with force like Hook, for example
• May be carelessly dropped in the middle of nowhere
• Don't drop ones aitches like Captain 'ook, say
• Hook starts the way he'd go on
• H, as with Hook?
• H sound — suck air in or out
• Send something down the wrong pipe, as it were