I've heard this before from a Russian speaker. I don't understand how it got written this way. It drives me a little nuts trying to imagine how it became written as such. A translation that got fucked repeatedly until finally it was only bots reprinting it?
"cum" is Latin for "with" and is sometimes used in English to show that something is two things at once, so "minstrel-cum-clown" would be someone who is both a minstrel and a clown