  Fomalhaut C (LP 876-10) is a low mass M4V star in the intriguing Fomalhaut
triple system and, like Fomalhaut A, possesses a debris disc. It is one of very
few nearby M-dwarfs known to host a debris disc and of these has by far the
lowest stellar mass. We present new resolved observations of the debris disc
around Fomalhaut C with the Atacama Large Millimetre Array which allow us to
model its properties and investigate the system's unique history. The ring has
a radius of 26 au and a narrow full width at half maximum of at most 4.2 au. We
find a 3$\sigma$ upper limit on the eccentricity of 0.14, neither confirming
nor ruling out previous dynamic interactions with Fomalhaut A that could have
affected Fomalhaut C's disc. We detect no $^{12}$CO J=3-2 emission in the
system and do not detect the disc in scattered light with HST/STIS or
VLT/SPHERE. We find the original Herschel detection to be consistent with our
ALMA model's radial size. We place the disc in the context of the wider debris
disc population and find that its radius is as expected from previous disc
radius-host luminosity trends. Higher signal-to-noise observations of the
system would be required to further constrain the disc properties and provide
further insight to the history of the Fomalhaut triple system as a whole.
