  A model for the dark halos of galaxy clusters, based on the Weyl geometric
scalar tensor theory of gravity (WST) with a MOND-like approximation, is
proposed. It is uniquely determined by the baryonic mass distribution of hot
gas and stars. A first heuristic check against empirical data for 19 clusters
(2 of which are outliers), taken from the literature, shows encouraging
results. Modulo a caveat resulting from different background theories (Einstein
gravity plus $\Lambda CDM$ versus WST), the total mass for 15 of the outlier
reduced ensemble of 17 clusters seems to be predicted correctly (in the sense
of overlapping $1\,\sigma$ error intervals).
