Possible Clues:

• 'Advise, tell about (6)'
• Make known it's not provided before end of May
• Report — by no means one extremely funny
• Brief -- unless before end of play
• Inform of new books provided over year
• Apprise
• Tell someone's alter ego from yours at first sight
• If in no end of doubt before close of play, declare!
• Brief attack on retreating Yankee
• Advise if Tony is spinning