Brain-freeze here. Two words left: 32A Head of old imperial guard making a king look round with terrible shout _K_LUNHE_ and 18D Joke about Jewish 'doctor' I concealed in lucky dip? Sort of GR_BB__
OK. That changes two other words. I have FOULARD for 26A, and if that's right I have F_ITT for 26D, assuming that 33A is indeed LETTERCARD. I assume that 23D is AUTHOR, but I don't quite get why- One such (not English) alternating his pieces?