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We present results of [CII]$\,158\,\rm{\mu m}$ emission line observations,and report the spectroscopic redshift confirmation of a strongly lensed($\mu\sim20$) star-forming galaxy, MACS0308-zD1 at $z=6.2078\pm0.0002$. The[CII] emission line is detected with a signal-to-noise ratio $>6$ within therest-frame UV bright clump of the lensed galaxy (zD1.1) and exhibits multiplevelocity components; the narrow [CII] has a velocity full-width-half-maximum(FWHM) of $110\pm20\,\rm{km/s}$, while broader [CII] is seen with an FWHM of$230\pm20\,\rm{km/s}$. The broader [CII] component is blueshifted($-80\pm20\,\rm{km/s}$) with respect to the narrow [CII] component, and has amorphology which extends beyond the UV-bright clump. We find that while thenarrow [CII] emission is most likely associated with zD1.1, the broadercomponent is possibly associated with outflowing gas. Based on thenon-detection of $\lambda_{\rm 158\,\mu m}$ dust continuum, we find thatMACS0308-zD1's star-formation activity occurs in a dust-free environment withthe stringent upper limit of infrared luminosity $\lesssim9\times10^{8}\,{\rmL_{\odot}}$. Targeting this strongly lensed faint galaxy for follow-up ALMA andJWST observations will be crucial to characterize the details of typical galaxygrowth in the early Universe.

The Extended [CII] under Construction? Observation of the brightest high-z lensed star-forming galaxy at z = 6.2