  Radio pulsars in short-period eccentric binary orbits can be used to study
both gravitational dynamics and binary evolution. The binary system containing
PSR J1141$-$6545 includes a massive white dwarf (WD) companion that formed
before the gravitationally bound young radio pulsar. We observe a temporal
evolution of the orbital inclination of this pulsar that we infer is caused by
a combination of a Newtonian quadrupole moment and Lense-Thirring precession of
the orbit resulting from rapid rotation of the WD. Lense-Thirring precession,
an effect of relativistic frame-dragging, is a prediction of general
relativity. This detection is consistent with the evolutionary scenario in
which the WD accreted matter from the pulsar progenitor, spinning up the WD to
a period $< 200$ seconds.
