In the low-energy limit of QCD, a description by means of perturbation theory is not possible: Here, no asymptotic freedom exists, but collective interactions between valence quarks and sea quarks gain strongly in significance.
Part of the effects of virtual quarks and virtual gluons in the "sea" can be assigned to a quark so well that the term "constituent quark" can serve as an effective description of the low-energy system.
This cloud, in the end, underlies the large constituent-quark masses.
Hadrons consist of "glued" constituent quarks.
The quantum chromodynamic binding energy of a valence quark in a hadron is the amount of energy required to make the hadron spontaneously emit a meson containing the valence quark.