  We report on the discovery of variable circular polarization from the remnant
of Nova Chamaeleontis 1953 (RR Cha). The circular polarization appears to be
modulated on the primary's spin period and harmonics of the positive superhump
period, with an amplitude peak-to-peak of almost ~10 per cent with both
negative and positive polarization. A recent study by Woudt & Warner of RR Cha
shows it to have both positive and negative superhumps, indicating the presence
of a precessing/tilted accretion disc. In addition, they also find a stable
period at 1950 s, characteristic of an Intermediate Polar. RR Cha also shows
deep eclipses with variable depth. We propose a possible explanation for the
origin of the polarized emission. We assume that it is of cyclotron origin. The
variations of the circular polarization with the proposed spin period are
caused by the rotation of the compact object. The long period variability arise
as a result of a precessing/tilted accretion disc, periodically obscuring
either of two accretion regions on the surface of the white dwarf. We also
point out several similarities of RR Cha with the SW Sex stars. The lack of a
time resolved spectroscopic study prevents to make any conclusion regarding its
possible SW Sex nature. Hence, such spectroscopic study is encouraged. RR Cha
is the second old nova exhibiting variable circular polarization and we
therefore encourage polarimetric observations of other nova remnants.
