I can delete the output. i guess, but i recall that not working all the time. And in cases where the output is littered through an expression that makes it not worth using the mode.

I think it currently clears only when you disable the mode.

If there's some clear overlays Emacs command that will do as well.

so i had cider-overlays-use-font-lock set to t and it was causing the overlays to stick around even after i turned off the mode and re-evaled things. That along wasn't an issue, but sometimes the overlays would, and i'm not sure how to describe this, block the cursor from traveling around. it was odd. 😕

Well it seems like the overlays can get stuck regardless. they just hang out and nothing removes them short of restarting emacs that i know of.