  We calculate top pair production and decay at the Tevatron $p\bar p$
collider, with the emission of an extra gluon, and study the corresponding
$W+5$\,jet top signals including full spin correlations in the $W \to \ell\nu$
leptonic and $W\to jj$ hadronic decays. We study the feasibility of
reconstructing $W+5$\,jet top events with a single $b$-tag, including realistic
energy resolution. Our suggested basic procedure based on kinematic fitting
achieves about 74\% reconstruction efficiency, with 74\% of the reconstructed
events correctly classified (purity); this improves to 82\% efficiency with
77\% purity in double-$b$-tagged events. We suggest possible refinements, based
on virtuality criteria, that give higher purity at the cost of lower
reconstruction efficiency.
