  Clustered quantum materials provide a new platform for the experimental study
of many-body entanglement. Here we address a simple model of a single-molecule
nano-magnet featuring N interacting spins in a transverse field. The field can
induce an entanglement transition (ET). We calculate the magnetisation,
low-energy gap and neutron-scattering cross-section and find that the ET has
distinct signatures, detectable at temperatures as high as 5% of the
interaction strength. The signatures are stronger for smaller clusters.
