Exploiting broad- and narrow-band images of the \textit{Hubble Space Telescope} from near-UV to I-band restframe, we study star-forming clumps six galaxies GASP sample undergoing strong ram-pressure stripping (RPS). Clumps are detected in H$\alpha$ near-UV, tracing star formation on different timescales. We consider located galaxy disks, stripped tails those formed gas but still close disk, cal...