Appears on the ice under big heavy strain.
Now, get off your high one, ride out to the plain.
It's opposite base, or with battery, rain.
Crack, horse, acid: probably DRUG or DRUGS.
It's two times what equals twelve, equation fixed.
With theory, G; gawking with one letter nixed.
Device or equipment, or nutriments mixed.
Six, string, instrument: probably GUITAR.
The westernmost part of a tropical isle.
A Johnson who scored triple-doubles with style.
When Barbie comes home, Ken greets her with a smile.
Haiti?, Earvin/Magic, ?: ? (I'm wondering whether there's some homophony going on here and it should be parsed as "eighty magic X". Searching the internet for "eighty magic dolls" didn't immediately turn up anything interesting, though.) [EDITED to add:] Duh, SteveV points out in comments that Haiti+magic+doll is surely VOODOO.
Drug, guitar, voodoo: SteveV's comment pointing out VOODOO suggests Jimi Hendrix (who was a guitarist, took drugs, and wrote a song with "Voodoo" in its title). Seems plausible, though I can't shake the feeling that he's unlikely to be the only person with those properties.