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My understanding is that Justice Souter sits regularly with the First Circuit like any other senior judge. I believe that his clerk, like those of the other retired justices, is usually detailed to an active SCOTUS justice. Does that mean that he writes his opinions for the First Circuit without help from clerks, that he borrows clerks from his colleagues to help, or what? Any former First Circuit clerks know?

I would assume that his clerk works both with Souter and an active Justice. I don't think Souter hears anything approaching a full caseload. A law clerk whose judge sat on a panel with Souter implied to me a few years ago that Souter's law clerk was very much involved in the work he did on the First Circuit.