  Hyperfine constants and anomalies of ground as well as few low lying excited
states of $^{113,115,117}$In III are studied with highly correlated
relativistic coupled-cluster theory. The ground state hyperfine splitting of
$^{115}$In III is estimated to be 106.8 GHz. A shift of almost 1.9 GHz of the
above frequency has been calculated due to modified nuclear dipole moment. This
splitting result shows its applicability as communication band and frequency
standards at $10^{-11}$ sec. Correlations study of hyperfine constants
indicates a few distinct features of many-body effects in the wave-functions in
and near the nuclear region of this ion. Astrophysically important forbidden
transition amplitudes are estimated for the first time in the literature to our
knowledge. The calculated oscillator strengths of few allowed transitions are
compared with recent experimental and theoretical results wherever available.
