clay pigeon

[clay pigeon] {n.}, {slang}, {informal} 1. A popular target at practice shooting made of clay and roughly resembling a pigeon; an easy target that doesn't move.

All he can shoot is a clay pigeon.

2. A person who, like a clay pigeon in target practice, is immobilized or is in a sensitive position and is therefore easily criticized or otherwise victimized.

Poor Joe is a clay pigeon.

3. A task easily accomplished like shooting an immobile clay pigeon.

The math exam was a clay pigeon.