The usual thing (assuming you have access to the separated parts, remix stems, whatever)
is to extract the essence of the tune - signature guitar riffs, the hooks, the chorus
vocals - and build a club track around that -- the structure will likely be completely
different to the original.
I recently did this with one of my tracks as an
exercise (well, no vocals) and it was quite a learning experience. Both are still heavily
works in progress, but let me see if I can link the most recent rough mixes...
Soundcloud link to Spacey Prog-ish Rock version
Soundcloud link to rough cut of Club Mix
So what carried
over was the guitar bits, a couple snippets from the FM bell lines, some heavily processed
snippets of the original bassline, and the pad. All-new percussion and bassline, and I'm
still debating adding other elements like gated choir pads, atmospheric sounds, etc...
(And yes, the current club mix is the "not enough bass track and too much lead