  We report the discovery of an eclipsing binary millisecond pulsar in the
globular cluster M92 (NGC6341) with the Five-hundred-meter Aperture Spherical
radio Telescope (FAST). PSR J1717+4308A, or M92A, has a pulse frequency of
316.5~Hz (3.16~ms) and a dispersion measure of 35.45 pc cm$^{-3}$. The pulsar
is a member of a binary system with an orbital period of 0.20~days around a
low-mass companion which has a median mass of $\sim$0.18~\Ms. From observations
so far, at least two eclipsing events have been observed in each orbit. The
longer one lasted for ~5000~s in the orbital phase range 0.1--0.5. The other
lasted for ~500~s and occurred between 1000--2000~s before or after the longer
eclipsing event. The lengths of these two eclipsing events also change. These
properties suggest that J1717+4308A is a ``red-back'' system with a low-mass
main sequence or sub-giant companion. Timing observations of the pulsar and
further searches of the data for additional pulsars are ongoing.
