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Models of stellar structure and evolution can be constrained using accuratemeasurements of the parameters of eclipsing binary members of open clusters.Multiple binary stars provide the means to tighten the constraints and, inturn, to improve the precision and accuracy of the age estimate of the hostcluster. In the previous two papers of this series, we have demonstrated theuse of measurements of multiple eclipsing binaries in the old open clusterNGC6791 to set tighter constraints on the properties of stellar models than waspreviously possible, thereby improving both the accuracy and precision of thecluster age. We identify and measure the properties of a non-eclipsing clustermember, V56, in NGC\,6791 and demonstrate how this provides additional modelconstraints that support and strengthen our previous findings. We analysemulti-epoch spectra of V56 from FLAMES in conjunction with the existingphotometry and measurements of eclipsing binaries in NGC6971. The parameters ofthe V56 components are found to be $M_{\rm p}=1.103\pm 0.008 M_{\odot}$ and$M_{\rm s}=0.974\pm 0.007 M_{\odot}$, $R_{\rm p}=1.764\pm0.099 R_{\odot}$ and$R_{\rm s}=1.045\pm0.057 R_{\odot}$, $T_{\rm eff,p}=5447\pm125$ K and $T_{\rmeff,s}=5552\pm125$ K, and surface [Fe/H]=$+0.29\pm0.06$ assuming that they havethe same abundance. The derived properties strengthen our previous bestestimate of the cluster age of $8.3\pm0.3$ Gyr and the mass of stars on thelower red giant branch (RGB), which is $M_{\rm RGB} = 1.15\pm0.02M_{\odot}$ forNGC6791. These numbers therefore continue to serve as verification points forother methods of age and mass measures, such as asteroseismology.

Age and helium content of the open cluster NGC 6791 from multiple eclipsing binary members. III. Constraints from a subgiant