Because I'm loath to ask c.l.l

Can the macro body in define-method-combination access the arguments in which the generic function was called?

>>10
I somehow doubt the Sussman cares a lot about CLOS.
If you dislike c.l.l, you can ask on IRC, I've found it quite helpful when asking various specific CL questions, however I think OP's question might be better fitted for newsgroups than IRC for a variety of reasons(complexity, expected answer length, poster's knowledge about the subject, ...).