We propose Universal Clock Field Theory (UCFT), wherein a single oscillatory phase field theta, defined modulo 2*pi, underlies the emergence of time, gauge interactions, gravitational dynamics, quantum measurement, and the dark sector.In this construction, theta arises via spontaneous symmetry breaking of a complex scalar fieldPhi(x) = rho(x) * exp(i * theta(x)),and its compact nature drives topological effects that yield emergent gauge fields, a non-perturbative Yang-Mills mass gap, and a derivation of the invariant speed of light.Coupling theta to gravity modifies Einstein’s equations, providing non-singular cosmologies and potential hairy black hole solutions. Furthermore, theta-driven decoherence addresses the quantum measurement problem, and a shallow potential or topological defects for theta naturally accommodate dark energy and dark matter.Although still in an exploratory stage, UCFT offers testable predictions and new avenues for theoretical and experimental research in fundamental physics.