It's a new year, so why not start it off with a new constructor? That may or may not be Will's reasoning, but today's crossword is indeed a debut for Topher Booth, and it is an auspicious beginning. We were keen on the theme (and yes, there's a trace of a pun there), and found the rest of the clues to be just right for a Thursday. Apart from those mentioned in the podcast, we'd like to salute 47A, Prefix with genetics, EPI (ok, if you say so!); 54D, Kind of wind ... or an alternative to wind,...