We report the result of a detailed analysis from a deep simultaneous 130 ks XMM-Newton & NuSTAR observation of the nearby (z = 0.0315) and bright starburst-AGN system: MCG-03-58-007. Rapid X-ray spectral variability has been detected, which may be caused by an obscuration event. We show that most of the observed variability may be caused by an inhomogeneous, highly ionized fast (v_w,1~ 0.10c and v_w,2 ~0.35c) disc-wind rather than a neutral absorber embedded in the clumpy torus. Such dramatic and fast variability of the wind, places MCG–3–58-007 among the unique objects such as the luminous quasar PDS 456, which is considered the prototype of fast disc-wind. We also show that most of the scattered soft X-ray emission in MCG–03–58–007 originates form the larger scale photoionized plasma, possibly associated with NLR gas, as seen from the presence of several narrow emission lines in the RGS spectra.