Honestly I'm shocked that a homebrewer would love this beer, as it seems to be more like smirnoff ice than craft beer to me. It doesn't surprise me that you couldn't find a clone. But, to each his own, and if you want to brew it I can help a bit.
I've been to the Leinenkugel brewery, and this is what I know:
All of their beers, except the Big Eddie series, are lagers. This beer is made with the same recipe as their Honey Weiss, minus the honey and with a flavor extract syrup added to the beer after pasteurization. This is the difficult part, because any flavor you add will probably be fermented out to some extent.
So, a clone? 2-row malt, maybe some 6-row, and some wheat,maybe 10 percent or so, cluster hops (according to their website), fermented with a lager yeast, add some blackberry extract to the secondary.