Can you "clear" Vaal ruins in Delve? If not what's the strategy to deal with them?

I'm a casual player so excuse me if this is pretty nooby but I've gone into 3 vaal ruins in delve and died in short order in all 3.

I tried clearing as I go but it seems there's an infinite amount of beasties, maybe there isn't and they're just super tough?

Anyway I cleared out a room ( to the point where only a few were running at me ) and moved out into the darkness. Burned through 4 flares and couldn't kill the next mob and I was still only a few steps beyond the first room.

I'm obviously missing something, can someone help me out?

Inside the vaal outposts (and for that matter, the other civilization outposts) are these lit-up circles on the floor. Standing on those circles will gradually light a series of candles/braziers/etc etc that allow you to explore the outpost without using flares. the lights will go out after a time.

As for the mobs, they appear to just constantly spawn, so fight and loot quick. I though it was kinda exciting. You are breaking into their house after all!

They are not infinite, there is just alot of them. Great for xp on deeper delve levels.