Possible Clues:

• Peacekeepers' troops initially regret being deceitful
• Collection of good books in university? Regret that's false
• The converse is correct
• Falsely disloyal
• That's been lying there
• Not even
• Start to turn with a twist and be lying there
• A nut may get to regret what 23 down is
• You can't believe it would turn and twist inside
• False or crooked