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In the ROSAT all-sky survey we serendipitously discovered an extended (~22x8arcmin) irregular-shaped X-ray diffuse emission located in H-ATLAS GAMA12field. The only nearby galaxy overdensities are two small groups of 3 galaxieseach spectroscopically confirmed at z=0.073 and z=0.11 located at the edge ofthe X-ray emission. In addition an NVSS/FIRST radio-galaxy is located exactlyalong the direction that connects the two brightest spots of the X-ray emissionand is not detected in any optical-to-FIR band. We propose a very cheap XMMobservation (14ks) of the entire X-ray emission that may correspond to arelatively nearby unvirialized large-scale structure thanks to which we willmeasure its redshift disentangle its morphological components and unveil its emission mechanisms. [truncated! Please see actual data for full text]