Leaking faucet, need help

DIY homeowner here with some plumbing experience, but not on one of these (see pictures). I was unable to find one like it on the web. It looks like I need to remove the faucets from below and then disassemble them in order to replace the leaking components. Removing the clip doesn't seem to free anything up. And if I try to loosen the nut above the sink, the whole unit turns below the sink, and the lines feeding the outlet disconnect. Many thanks, and apologies for the layman's terminology.

Howard