  We explore the possibility that the N-rich young proto-galaxy GN-z11 recently
observed at z=10.6 by the James Webb Space Telescope is the result of the
formation of second generation stars from pristine gas and Asymptotic Giant
Branch (AGB) ejecta in a massive globular cluster or nuclear star cluster. We
show that a second generation forming out of gas polluted by the ejecta of
massive AGB stars and mixed with gas having a standard composition accounts for
the unusually large N/O in the GN-z11 spectrum. The timing of the evolution of
massive (4-7.5M$_{\odot}$) AGBs also provides a favourable environment for the
growth of a central stellar mass black hole to the Active Galactic Nucleus
stage observed in GN-z11. According to our model the progenitor system was born
at an age of the Universe of $\simeq 260 - 380$Myr, well within the
pre-reionization epoch.
