because I thought the joke could get lost for people who don't know that an Ordinary is a clerical role
This reminded me of a quote from SF and fantasy author Mary Gentle, in her introduction to her
White Crow series:
This is why, when I say that there are jokes in Rats & Gargoyles that only three people in the world will understand, and one of them is dead, this is not an apology.
Please don't be afraid of obscure jokes and subtle references. Maybe some people won't get them, but others will - they'll connect what you've written with what they know, and a certain joyful smile will cross their face: "Oh,
yes, that's what he means." Or maybe they won't understand at first, but will be motivated to do some research, and then that moment of discovery and connection will come a little later.