"The child is clean."
Are children really ever clean? I mean seriously, I was a really messy kid. I'm still messy.
Can someone tell me how to pronounce that last word? The audio doesn't match up to what I'd expect it to sound like.
The reason is seems off to you is probably because when the ㅅ is the last character in a syllable block, it's sound becomes like a t. Koreans don't aspirate their words, so when the ㅅ comes, the rest of the sound comes to a stop, and therefore sounds like t.
They pronounce it correctly; in that position the "sieut" character sounds like a t rather than an s.