  We report a candidate tidal disruption event (TDE) found in the Zwicky
Transient Facility (ZTF) survey data. This candidate, with its transient name
AT2021acak, showed brightness increases of $\sim$1\,mag around MJD~59500 and
subsequent power-law--like brightness declines. We have conducted multiple
optical spectroscopic observations with the 2.4-m Lijiang telescope and one
observation at X-ray and ultraviolet (UV) bands with the {\it Neil Gehrels
Swift Observatory (Swift)}. The optical spectra of the source show broad H and
He emission line and Fe emission features. Possible 0.3--2\,keV X-ray and
bright UV emission of the source was detected. We analyze the declines of the
optical light curves, the emission features of the optical spectra, and the
constructed broad-band UV and optical spectrum. The properties derived from the
analyses are consistent with those of reported (candidate) TDEs, and in
particular very similar to those of ASASSN-18jd. The identification is
complicated by the host being likely an AGN, and thus further observations of
the event and quiescent host are required in order to have a clear
understanding of the nature of this transient event.
