Possible Clues:

• Projecting beam fixed at one end
• Am I unable to get the prize, even if it's sticking out?
• Smart to retain opponent's support at one end
• Hoisting this, the builder strained a ventricle
• Worker and I visible in bright beam
• Beam, adroit member of opposition being arrested
• Structural framework that is fixed at one end only
• Clean rivet may fail in such a bridge
• Part of bridge, say, is being intelligent about opponent
• Support a ventricle that's shaky