Possible Clues:

• Copper hit out concerning divination
• Is one able to foretell what one's 1 across will be?
• Foretelling how he might get support with a jerk
• For seeing sound?
• Drunk hit copper with knowledge of likely outcome
• Support chap with short sign of approval from Sibyl, perhaps?
• Like some visions
• Ahead of its time
• Foreseeing future events, copper hit out
• Criminal hit copper — that's ominous!