Related Clues:

• Castle guards want moat to be more than this!
• Want to be in castle and heavily involved
• Want to get into fortress - but only so far!
• (Of water) over the top of one's wellies?
• Halfway up the leg
• Submerged to one's patella
• Seriously embroiled
• Maintenance covers desire to be heavily involved
• Keen to gambol by the sea and in the shallows
• Ultra ----- Scene
• Immersed up to the patella
• Continue to restrict call for such a big involvement
• Deeply involved (in something)
• Very much involved in maintenance - a prerequisite
• Halfway up one's leg