  The center of the galaxy cluster RX J0054.0-2823 at z = 0.292 is a
dynamically active region which includes an interacting system of three
galaxies surrounded by a large halo of intra-cluster light. We report here the
discovery of an S-shaped feature of total length 11 arcsec in the central
region of this cluster and discuss its physical nature. We test the
gravitational lensing assumption by doing a mass modelling of the central part
of the galaxy cluster. We very naturally reproduce position and form of this
S-shape feature as a gravitationally lensed background object at redshift
between 0.5 and 1.0. We conclude that the lensing nature is the very probable
explanation for this S-shaped arc; the ultimate proof will be the spectroscopic
confirmation by measuring the high redshift of this elongated feature with
surface brightness V~24mag/arcsec2.
