ATP-dependent specificity component of the Clp protease. It directs the protease to specific substrates. Can perform chaperone functions in the absence of ClpP (By similarity). Degrades anti-sigma-E factor RseA in the presence of ClpP2. Depletion experiments (using anti-sense RNA) stops degradation of anti-sigma-E factor RseA. Belongs to the ClpA/ClpB family. ClpC subfamily.