Related Clues:

• Gradually disappear from view
• Cause to lose lustre, say silver
• Gradually grow faint
• This will not make one so bright in a lake-like way
• A mere likeness, perhaps? But that makes it so dull
• Are, perhaps, at Oxford
• To put pitch on a broken shin will discolour it on the outside
• Like a bit of water? That'll take the shine off it!
• Sort of like a little pond - dull on the surface
• The way to spoil the surface of what's like a little pool, perhaps
• On the surface, a like a little lake, perhaps
• On the surface this is somewhat a mountain lough
• Enough to make a shirt around the North - at least on the surface
• Like a little water on the surface?
• Might this spoil the surface, a bit like a little lake?