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We detect bright emission in the far infrared fine structure [O III] 88$\mu$mline from a strong lensing candidate galaxy, H-ATLAS J113526.3-014605,hereafter G12v2.43, at z=3.127, using the $\rm 2^{nd}$ generation Redshift (z)and Early Universe Spectrometer (ZEUS-2) at the Atacama Pathfinder ExperimentTelescope (APEX). This is only the fifth detection of this far-IR line from asub-millimeter galaxy at the epoch of galaxy assembly. The observed [O III]luminosity of $7.1\times10^{9}\,\rm(\frac{10}{\mu})\,\rm{L_{\odot}}\,$ likelyarises from HII regions around massive stars, and the amount of Lyman continuumphotons required to support the ionization indicate the presence of$(1.2-5.2)\times10^{6}\,\rm(\frac{10}{\mu})$ equivalent O5.5 or higher stars;where $\mu$ would be the lensing magnification factor. The observed lineluminosity also requires a minimum mass of $\sim 2\times10^{8}\,\rm(\frac{10}{\mu})\,\rm{M_{\odot}}\,$ in ionized gas, that is $0.33\%$of the estimated total molecular gas mass of$6\times10^{10}\,\rm(\frac{10}{\mu})\,\rm{M_{\odot}}\,$. We compile multi-bandphotometry tracing rest-frame UV to millimeter continuum emission to furtherconstrain the properties of this dusty high redshift star-forming galaxy. ViaSED modeling we find G12v2.43 is forming stars at a rate of 916$\rm(\frac{10}{\mu})\,\rm{M_{\odot}}\,\rm{yr^{-1}}$ and already has a stellarmass of $8\times 10^{10}\,\rm(\frac{10}{\mu})\,\rm{M_{\odot}}\,$. We alsoconstrain the age of the current starburst to be $\leqslant$ 5 million years,making G12v2.43 a gas rich galaxy lying above the star-forming main sequence atz$\sim$3, undergoing a growth spurt and, could be on the main sequence withinthe derived gas depletion timescale of $\sim$66 million years.

Detection of [O III] at z~3: A Galaxy above the Main Sequence, Rapidly Assembling its Stellar Mass