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We aimed to identify the variable X-ray source 3XMM J000511.8+634018, whichwas serendipitously discovered through routine inspections while the 3XMMcatalogue was compiled. We analysed the archival XMM-Newton observation of thesource, obtained BUSCA photometry in three colours, and performed opticalspectroscopy with the LBT. These data were supplemented by archivalobservations from the Zwicky Transient Facility. Based on its optical and X-rayproperties, 3XMM J000511.8+634018 is classified as a magnetic cataclysmicvariable, or polar. The flux is modulated with a period of 2.22 hr (8009.1 +-0.2 s), which we identify with the orbital period. The bright phases are highlyvariable in X-ray luminosity from one cycle to the next. The source shows athermal plasma spectrum typical of polars without evidence of a luminous softblackbody-like component. It is non-eclipsing and displays one-pole accretion.The X-ray and BUSCA light curves show a stream absorption dip, which suggestsan inclination 50degr < i < 75degr. The phasing of this feature, which occursat the end of the bright phase, requires a somewhat special accretion geometrywith a stream running far around the white dwarf before it is magneticallychannelled. The period of this polar falls within the period gap of thecataclysmic variables (2.15-3.18 h), but appears to fall just below the minimumperiod when only polars are considered.

Identification of 3XMM J000511.8+634018 as a new polar at P(orb)=133.5 min -- is it inside or outside the period gap?