  We demonstrate the spatial separation of pyrrole and pyrrole(H$_2$O) clusters
from the other atomic and molecular species in a supersonically-expanded beam
of pyrrole and traces of water seeded in high-pressure helium gas. The
experimental results are quantitatively supported by simulations. The obtained
pyrrole(H$_2$O) cluster beam has a purity of ~100 %. The extracted rotational
temperature of pyrrole and pyrrole(H$_2$O) from the original supersonic
expansion is $T_\text{rot}=0.8\pm0.2$ K, whereas the temperature of the
deflected, pure-pyrrole(H$_2$O) part of the molecular beam corresponds to
$T_\text{rot}\approx0.4$ K.
