Possible Clues:

• Grassy mound
• Band fronted by Carol Decker
• Clever-clogs ignoring Washington achieves minor eminence
• Small natural hill, perhaps grassy
• Round hillock
• Almost recognise lines of hillock
• No trainees following Kay on mound
• Mound where Charles met Cromwell?
• Troll's ___ Park (near-rhyming Seattle locale)
• Put back part of wall on Kentish hill