  Pair production of tau leptons in two photon collision ${\gamma\gamma \to
\tau^{+}\tau}^{-}$ is studied at CLIC to test CP violating QED couplings of tau
leptons. CP violating effects are investigated using tau pair spin correlations
which are observed through the hadronic decay of each $\tau$ into $\pi\nu$.
Competitive bounds with previous works on the electric dipole moment from CP
odd terms have been obtained.
