  The 3C 220.3 system is a rare case of a foreground narrow-line radio galaxy
("galaxy A," $z_A = 0.6850$) lensing a background submillimeter galaxy
($z_{{\rm SMG1}} = 2.221$). New spectra from MMT/Binospec confirm that the
companion galaxy ("galaxy B") is part of the lensing system with $z_B =
0.6835$. New three-color HST data reveal a full Einstein ring and allow a more
precise lens model. The new HST images also reveal extended emission around
galaxy A, and the spectra show extended [OII] emission with irregular
morphology and complex velocity structure. All indications are that the two
lensing galaxies are a gravitationally interacting pair. Strong [OII] emission
from both galaxies A and B suggests current star formation, which could be a
consequence of the interaction. This would indicate a younger stellar
population than previously assumed and imply smaller stellar masses for the
same luminosity. The improved lens model and expanded spectral energy
distributions have enabled better stellar-mass estimates for the foreground
galaxies. The resulting dark matter fractions are ~0.8, higher than previously
calculated. Deeper Chandra imaging shows extended X-ray emission but no
evidence for a point X-ray source associated with either galaxy. The detection
of X-rays from the radio lobes of 3C 220.3 allows an estimate of ~3 nT for the
magnetic fields in the lobes, a factor of ~3 below the equipartition fields, as
typical for radio galaxies.
