Correct on the lighting as far as color temp goes, but you'll want to consider getting a HPS bulb/ballast for flowering.

However as for the current condition of your clone... looks like I guessed right about the spray... It looks a lot like what happened when I went into panic mode after discovering spider mites. I thought I had killed a couple of my young plants because the leaves were severely burned like yours. Good news was that I didn't kill off the nodes and it took a long time but they came back to life. It took a couple sets of new growth before the new stuff started to look normal again, anything that came in contact with my organic insecticide was mutated. By the looks of your clone it appears as though there is some growth that wasn't severely burned so I'd say you've got a fair chance to revive it, so good luck. Just make sure you don't make too many changes to its conditions during its time of recovery or it'll go into shock and you'll struggle even more. Keep away from feeding it any nutes, and if you do for some reason make sure its something to help root developement.