"a clustering of" is a correct and usable phrase in written English.
It is often used to refer to a number of things that are grouped together, such as people or objects. For example, "There was a clustering of people around the exhibit."
Instead of offering buyers typical suburban tract homes on large lots, the builder created a clustering of town houses and free-standing colonials.
Yet the shortage is not something that will be solved with a clustering of churches, or new responsibilities for the laity, parishioners and some priests said.
The metabolic syndrome consists of a clustering of metabolic risk factors in one individual.
The evaluation of management quality is made using a clustering of item weights into seven checklists.
In figure 6 a clustering of the first two component's scores is shown.
The tensile instability in smoothed particle hydrodynamics results in a clustering of smoothed particle hydrodynamics (SPH) particles.
We proposed a two-step algorithm that considers the spatial correlation of these variables in a clustering of sites.
… We're seeing a clustering of IT in Detroit: You've got us, Quicken Loans, Compuware, Blue Cross/Blue Shield of Michigan.
One "clear pattern" to emerge was a clustering of antisocial tendencies among young fans of pop, rap, and rock.
The two principal component model showed a clustering of samples, with a good reproducibility of the center points.
b The corresponding loading plot showing a clustering of steroids and monohydroxy-fatty acids at the high end of endurance opposed by a clustering of diacyl-glycerols and gamma-glutamyl amino acids at the negative end.
