  Flat bands amplify correlation effects and are of extensive current interest.
They provide a platform to explore both topology in correlated settings and
correlation physics enriched by topology. Recent experiments in correlated
kagome metals have found evidence for strange-metal behavior. A major
theoretical challenge is to study the effect of local Coulomb repulsion when
the band topology obstructs a real-space description. In a variant to the
kagome lattice, we identify an orbital-selective Mott transition for the first
time in any system of coupled topological flat and wide bands. This was made
possible by the construction of exponentially localized and Kramers-doublet
Wannier functions, which in turn leads to an effective Kondo lattice
description. Our findings show how quasiparticles are formed in such coupled
topological flat-wide band systems and, equally important, how they are
destroyed. Our work provides a conceptual framework for the understanding of
the existing and emerging strange-metal properties in kagome metals and beyond.
