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Aims: We aim to confirm whether the eclipsing cataclysmic variable V902 Monis an Intermediate Polar, to characterise its X-ray spectrum and flux, and torefine its orbital ephemeris and spin period. Methods: We performedspectrographic observations of V902 Mon in 2016 with the 2.2m Calar Altotelescope, and X-ray photometry and spectroscopy with XMM-Newton in October2017. This data was supplemented by several years of AAVSO visual photometry.Results: We have confirmed V902 Mon as an IP based on detecting the spinperiod, with a value of 2,208s, at multiple epochs. Spectroscopy of the donorstar and Gaia parallax yield a distance of 3.5+1.3-0.9, kpc, suggesting anX-ray luminosity one or two orders of magnitude lower than the 10^33 erg/stypical of previously known IPs. The X-ray to optical flux ratio is also verylow. The inclination of the system is more than 79deg, with a most likely valueof around 82deg. We have refined the eclipse ephemeris, stable over 14,000cycles. The Halpha line is present throughout the orbital cycle and is clearlypresent during eclipse, suggesting an origin distant from the white dwarf, andshows radial velocity variations at the orbital period. The amplitude andoverall recessional velocity seem inconsistent with an origin in the disc. The\emph{XMM-Newton} observation reveals a partially absorbed plasma model typicalof magnetic CVs, with a fluorescent iron line at 6.4keV showing a largeequivalent width of 1.4keV. Conclusions: V902 Mon is an IP, and probably amember of the hypothesized X-ray underluminous class of IPs. It is likely to bea disc accretor, though the radial velocity behaviour of the Halpha lineremains puzzling. The large equivalent width of the fluorescent iron line, thesmall FX/Fopt ratio, and the only marginal detection of X-ray eclipses suggeststhat the X-ray emission arises from scattering.

V902 Monocerotis: a likely disc-accreting intermediate polar