Not sure about a plugin, but there are some converters out there that will convert your geometry to OBJ/3DS/etc, which can then be read by AC3D.
Biturn is the only free one I know of (should be able to find it by Googling for "Biturn") - I've used it very little and cannot really attest to how well it works on Lightwave geometries, but maybe it will work for you?
Good luck
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