Two bits of background that should in absolutely no way influence the way you judge Clea's ability: they got their name by using the initials of the four girls' first names, and they're the rejects from "Popstars: The Rivals". Well, if that hasn't prejudiced your views you're made of stronger stuff than me.
The toneless intro doesn't help matters, but Stuck In The Middle does eventually find some sort of rhythm in its chorus. It's actually cringe-worthy when Clea's individuals try to hit the high notes. The singing is generally awful and the song itself isn't much better.
It's absolutely no surprise that this quartet didn't succeed during their TV days. What is surprising is that someone didn't tell them there was a very good reason for that. Not even in today's market should this lot chart inside the top 20.