We propose a strategy to access the component of the ρ resonance in lattice QCD. Through a mixed action formalism (overlap valence on domain wall sea), the energy of the component is derived at different valence quark masses, and shows a linear dependence on . The slope is determined to be , from which the valence sigma term is extracted to be MeV using the Feynman-Hellman theorem. At the physical pion mass, the mass of the component is interpolated to be , which is close to the ρ resonance mass. We also obtain the leptonic decay constant of the component to be , which can be compared with the experimental value through the relation , with being the on-shell wavefunction renormalization of ρ owing to the interaction. We emphasize that and of the component, which are obtained for the first time from QCD, can be taken as the input parameters of ρ in effective field theory studies where ρ acts as a fundamental degree of freedom.