Possible Clues:

• Section of quaysides Palermo erected are out of date
• Went by end of terrace, outdated
• Went by valley keeping especially to the north
• Slipped away
• Mistake visiting editor passed?
• Ebbing river that floods over tours passed by
• Went by ebbing river putting legs in
• Led apes astray, having passed by
• Electronic circuits and leads regularly being passed
• Slid by