I agree paulnz, and Phil. Novice, learner or student would all have made more sense. Why on earth did the setter choose lecturer?!! Found this clue a bit of a dogs dinner.
Thanks to Geeker for enlightening me on 16d as, like Brendan, I thought it was the rodent without the G backwards in the first 5 letters. And I thought it must then be OTT backwards for silver tongued!
To many favourites to name, but thanks for all the music references for the excellent 5d!
Thanks also to whoever pointed out the alliterations - I"d totally missed that.