Possible Clues:

• Ben undergoes sex change in spring
• Spring in a futon needs altering
• Is this a concern for Irish Water? Well, one might drink to that!
• UN brought in if Nato scrambled jet
• Abundant source
• Middle of a square, sometimes
• Fellow with excess of butter, maybe, but no mass water source?
• Park squirter
• Ornamental structure with jets and spouts of water
• Marcel Duchamp work from 1917, using a porcelain urinal