  We have calculated the 3-point correlation function for the electromagnetic
interaction of the pion in an ensembles of instantons and anti-instantons,
modelling the QCD vacuum. The results are well described by a pion pole and the
pion formfactor is extracted, nicely following a standard monopole fit. The
experimental data on the formfactor are well reproduced, provided an average
instanton size is fixed at ${\bar\rho}=0.35\pm 0.03\fm$, the same as found for
a variety of other correlation functions and was found on the lattice.
