  We report results from an experiment measuring the semi-inclusive reaction
$d(e,e'p_s)$ where the proton $p_s$ is moving at a large angle relative to the
momentum transfer. If we assume that the proton was a spectator to the reaction
taking place on the neutron in deuterium, the initial state of that neutron can
be inferred. This method, known as spectator tagging, can be used to study
electron scattering from high-momentum (off-shell) neutrons in deuterium. The
data were taken with a 5.765 GeV electron beam on a deuterium target in
Jefferson Laboratory's Hall B, using the CLAS detector. A reduced cross section
was extracted for different values of final-state missing mass $W^{*}$,
backward proton momentum $\vec{p}_{s}$ and momentum transfer $Q^{2}$. The data
are compared to a simple PWIA spectator model. A strong enhancement in the data
observed at transverse kinematics is not reproduced by the PWIA model. This
enhancement can likely be associated with the contribution of final state
interactions (FSI) that were not incorporated into the model. A ``bound neutron
structure function'' $F_{2n}^{eff}$ was extracted as a function of $W^{*}$ and
the scaling variable $x^{*}$ at extreme backward kinematics, where effects of
FSI appear to be smaller. For $p_{s}>400$ MeV/c, where the neutron is far
off-shell, the model overestimates the value of $F_{2n}^{eff}$ in the region of
$x^{*}$ between 0.25 and 0.6. A modification of the bound neutron structure
function is one of possible effects that can cause the observed deviation.
