Got it done without using the forum, but benefitted from an accidental bonus of hint about "acting" when I loked again at last week's forum!
But didn't find what I was looking for: please can someone parse last week's 13d? "Not sure about one getting time off for lecture". I think "earwigging", defn "lecture", and presumably some word loses a "t", and there's "a", "an" or "i" in it, but beyond that ... ?
And is there anywhere to go for explanations of previous clues, like the "Annotated Solutions" which the Guardian used to provide?