  The cluster states in $^{13}{\rm C}$ are investigated by antisymmetrized
molecular dynamics. By investigating the spectroscopic factors, the cluster
configurations of the excited states are discussed. It is found that the
$1/2^+_2$ state is dominantly composed of the $^{12}{\rm C}(0^+_2)\otimes
s_{1/2}$ configuration and can be regarded as a Hoyle analogue state. On the
other hand, the p-wave states ($3/2^-$ and $1/2^-$) do not have such structure,
because of the coupling with other configurations. The isoscalar monopole and
dipole transition strengths from the ground to the excited states are also
studied. It is shown that the excited $1/2^-$ states have strong isoscalar
monopole transition strengths consistent with the observation. On the other
hand, the excited $1/2^+$ states unexpectedly have weak isoscalar dipole
transitions except for the $1/2^+_1$ state. It is discussed that the
suppression of the dipole transition is attributed to the property of the
dipole operator.
